diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2611b69d..caf878a3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+SystemJS 4.0.1 (2019/07/06)
+* Fix IE11 regression related to loading json files (https://github.com/systemjs/systemjs/pull/1963, @joeldenning)
+* Fix bug where System.import() rejected incorrectly, due to unrelated errors (https://github.com/systemjs/systemjs/pull/1963)
+
 SystemJS 4.0.0 (2019/06/29)
 * Support `<base href>` setting baseURL (https://github.com/systemjs/systemjs/pull/1957, @LarsDenBakker)
 * Use `Error` over `new Error` to reduce footprint (https://github.com/systemjs/systemjs/pull/1951, @joeldenning)
diff --git a/dist/s.js b/dist/s.js
index 30c5a4b8..d9103d75 100644
--- a/dist/s.js
+++ b/dist/s.js
@@ -1,5 +1,5 @@
 /*
-* SJS 4.0.0
+* SJS 4.0.1
 * Minimal SystemJS Build
 */
 (function () {
@@ -364,12 +364,6 @@
    * Supports loading System.register via script tag injection
    */
 
-  let err;
-  if (typeof window !== 'undefined')
-    window.addEventListener('error', function (e) {
-      err = e.error;
-    });
-
   const systemRegister = systemJSPrototype.register;
   systemJSPrototype.register = function (deps, declare) {
     err = undefined;
@@ -378,7 +372,7 @@
 
   systemJSPrototype.instantiate = function (url, firstParentUrl) {
     const loader = this;
-    if (url.endsWith('.json')) {
+    if (url.substr(-5) === '.json') {
       return fetch(url).then(function (resp) {
         return resp.text();
       }).then(function (source) {
@@ -388,19 +382,30 @@
       });
     } else {
       return new Promise(function (resolve, reject) {
+        let err;
+
+        function windowErrorListener(evt) {
+          if (evt.filename === url)
+            err = evt.error;
+        }
+
+        window.addEventListener('error', windowErrorListener);
+
         const script = document.createElement('script');
         script.charset = 'utf-8';
         script.async = true;
         script.crossOrigin = 'anonymous';
         script.addEventListener('error', function () {
+          window.removeEventListener('error', windowErrorListener);
           reject(Error('Error loading ' + url + (firstParentUrl ? ' from ' + firstParentUrl : '')));
         });
         script.addEventListener('load', function () {
+          window.removeEventListener('error', windowErrorListener);
           document.head.removeChild(script);
-          // Note URL normalization issues are going to be a careful concern here
+          // Note that if an error occurs that isn't caught by this if statement,
+          // that getRegister will return null and a "did not instantiate" error will be thrown.
           if (err) {
             reject(err);
-            return err = undefined;
           }
           else {
             resolve(loader.getRegister());
diff --git a/dist/s.min.js b/dist/s.min.js
index 1eaa885b..a14d25f2 100644
--- a/dist/s.min.js
+++ b/dist/s.min.js
@@ -1 +1 @@
-!function(){const e="undefined"!=typeof self,n=e?self:global;let t;if("undefined"!=typeof document){const e=document.querySelector("base[href]");e&&(t=e.href)}if(!t&&"undefined"!=typeof location){const e=(t=location.href.split("#")[0].split("?")[0]).lastIndexOf("/");-1!==e&&(t=t.slice(0,e+1))}const r=/\\/g,o="undefined"!=typeof Symbol,i=o&&Symbol.toStringTag,c=o?Symbol():"@";function u(){this[c]={}}const s=u.prototype;let l;s.import=function(e,n){const t=this;return Promise.resolve(t.resolve(e,n)).then(function(e){const n=function e(n,t,r){let o=n[c][t];if(o)return o;const u=[],s=Object.create(null);i&&Object.defineProperty(s,i,{value:"Module"});let l=Promise.resolve().then(function(){return n.instantiate(t,r)}).then(function(e){if(!e)throw Error("Module "+t+" did not instantiate");const r=e[1](function(e,n){o.h=!0;let t=!1;if("object"!=typeof e)e in s&&s[e]===n||(s[e]=n,t=!0);else for(let n in e){let r=e[n];n in s&&s[n]===r||(s[n]=r,t=!0)}if(t)for(let e=0;e<u.length;e++)u[e](s);return n},2===e[1].length?{import:function(e){return n.import(e,t)},meta:n.createContext(t)}:void 0);return o.e=r.execute||function(){},[e[0],r.setters||[]]});const f=l.then(function(r){return Promise.all(r[0].map(function(o,i){const c=r[1][i];return Promise.resolve(n.resolve(o,t)).then(function(r){const o=e(n,r,t);return Promise.resolve(o.I).then(function(){return c&&(o.i.push(c),!o.h&&o.I||c(o.n)),o})})})).then(function(e){o.d=e})});return f.catch(function(e){o.e=null,o.er=e}),o=n[c][t]={id:t,i:u,n:s,I:l,L:f,h:!1,d:void 0,e:void 0,er:void 0,E:void 0,C:void 0}}(t,e);return n.C||function(e,n){return n.C=function e(n,t,r){if(!r[t.id])return r[t.id]=!0,Promise.resolve(t.L).then(function(){return Promise.all(t.d.map(function(t){return e(n,t,r)}))})}(e,n,{}).then(function(){return function e(n,t,r){if(r[t.id])return;if(r[t.id]=!0,!t.e){if(t.er)throw t.er;return t.E?t.E:void 0}let o;return t.d.forEach(function(t){{const i=e(n,t,r);i&&(o=o||[]).push(i)}}),o?Promise.all(o).then(i):i();function i(){try{let e=t.e.call(f);if(e)return e=e.then(function(){t.C=t.n,t.E=null}),t.E=t.E||e;t.C=t.n}catch(e){throw t.er=e,e}finally{t.L=t.I=void 0,t.e=null}}}(e,n,{})}).then(function(){return n.n})}(t,n)})},s.createContext=function(e){return{url:e}},s.register=function(e,n){l=[e,n]},s.getRegister=function(){const e=l;return l=void 0,e};const f=Object.freeze(Object.create(null));let d;n.System=new u,"undefined"!=typeof window&&window.addEventListener("error",function(e){d=e.error});const h=s.register;s.register=function(e,n){d=void 0,h.call(this,e,n)},s.instantiate=function(e,n){const t=this;return e.endsWith(".json")?fetch(e).then(function(e){return e.text()}).then(function(e){return[[],function(n){return{execute:function(){n("default",JSON.parse(e))}}}]}):new Promise(function(r,o){const i=document.createElement("script");i.charset="utf-8",i.async=!0,i.crossOrigin="anonymous",i.addEventListener("error",function(){o(Error("Error loading "+e+(n?" from "+n:"")))}),i.addEventListener("load",function(){if(document.head.removeChild(i),d)return o(d),d=void 0;r(t.getRegister())}),i.src=e,document.head.appendChild(i)})},e&&"function"==typeof importScripts&&(s.instantiate=function(e){const n=this;return new Promise(function(t,r){try{importScripts(e)}catch(e){r(e)}t(n.getRegister())})}),s.resolve=function(e,n){const o=function(e,n){if(-1!==e.indexOf("\\")&&(e=e.replace(r,"/")),"/"===e[0]&&"/"===e[1])return n.slice(0,n.indexOf(":")+1)+e;if("."===e[0]&&("/"===e[1]||"."===e[1]&&("/"===e[2]||2===e.length&&(e+="/"))||1===e.length&&(e+="/"))||"/"===e[0]){const t=n.slice(0,n.indexOf(":")+1);let r;if(r="/"===n[t.length+1]?"file:"!==t?(r=n.slice(t.length+2)).slice(r.indexOf("/")+1):n.slice(8):n.slice(t.length+("/"===n[t.length])),"/"===e[0])return n.slice(0,n.length-r.length-1)+e;const o=r.slice(0,r.lastIndexOf("/")+1)+e,i=[];let c=-1;for(let e=0;e<o.length;e++)-1!==c?"/"===o[e]&&(i.push(o.slice(c,e+1)),c=-1):"."===o[e]?"."!==o[e+1]||"/"!==o[e+2]&&e+2!==o.length?"/"===o[e+1]||e+1===o.length?e+=1:c=e:(i.pop(),e+=2):c=e;return-1!==c&&i.push(o.slice(c)),n.slice(0,n.length-r.length)+i.join("")}}(e,n||t);if(!o){if(-1!==e.indexOf(":"))return Promise.resolve(e);throw Error('Cannot resolve "'+e+(n?'" from '+n:'"'))}return Promise.resolve(o)}}();
\ No newline at end of file
+!function(){const e="undefined"!=typeof self,n=e?self:global;let t;if("undefined"!=typeof document){const e=document.querySelector("base[href]");e&&(t=e.href)}if(!t&&"undefined"!=typeof location){const e=(t=location.href.split("#")[0].split("?")[0]).lastIndexOf("/");-1!==e&&(t=t.slice(0,e+1))}const r=/\\/g,o="undefined"!=typeof Symbol,i=o&&Symbol.toStringTag,c=o?Symbol():"@";function u(){this[c]={}}const s=u.prototype;let l;s.import=function(e,n){const t=this;return Promise.resolve(t.resolve(e,n)).then(function(e){const n=function e(n,t,r){let o=n[c][t];if(o)return o;const u=[],s=Object.create(null);i&&Object.defineProperty(s,i,{value:"Module"});let l=Promise.resolve().then(function(){return n.instantiate(t,r)}).then(function(e){if(!e)throw Error("Module "+t+" did not instantiate");const r=e[1](function(e,n){o.h=!0;let t=!1;if("object"!=typeof e)e in s&&s[e]===n||(s[e]=n,t=!0);else for(let n in e){let r=e[n];n in s&&s[n]===r||(s[n]=r,t=!0)}if(t)for(let e=0;e<u.length;e++)u[e](s);return n},2===e[1].length?{import:function(e){return n.import(e,t)},meta:n.createContext(t)}:void 0);return o.e=r.execute||function(){},[e[0],r.setters||[]]});const f=l.then(function(r){return Promise.all(r[0].map(function(o,i){const c=r[1][i];return Promise.resolve(n.resolve(o,t)).then(function(r){const o=e(n,r,t);return Promise.resolve(o.I).then(function(){return c&&(o.i.push(c),!o.h&&o.I||c(o.n)),o})})})).then(function(e){o.d=e})});return f.catch(function(e){o.e=null,o.er=e}),o=n[c][t]={id:t,i:u,n:s,I:l,L:f,h:!1,d:void 0,e:void 0,er:void 0,E:void 0,C:void 0}}(t,e);return n.C||function(e,n){return n.C=function e(n,t,r){if(!r[t.id])return r[t.id]=!0,Promise.resolve(t.L).then(function(){return Promise.all(t.d.map(function(t){return e(n,t,r)}))})}(e,n,{}).then(function(){return function e(n,t,r){if(r[t.id])return;if(r[t.id]=!0,!t.e){if(t.er)throw t.er;return t.E?t.E:void 0}let o;return t.d.forEach(function(t){{const i=e(n,t,r);i&&(o=o||[]).push(i)}}),o?Promise.all(o).then(i):i();function i(){try{let e=t.e.call(f);if(e)return e=e.then(function(){t.C=t.n,t.E=null}),t.E=t.E||e;t.C=t.n}catch(e){throw t.er=e,e}finally{t.L=t.I=void 0,t.e=null}}}(e,n,{})}).then(function(){return n.n})}(t,n)})},s.createContext=function(e){return{url:e}},s.register=function(e,n){l=[e,n]},s.getRegister=function(){const e=l;return l=void 0,e};const f=Object.freeze(Object.create(null));n.System=new u;const d=s.register;s.register=function(e,n){err=void 0,d.call(this,e,n)},s.instantiate=function(e,n){const t=this;return".json"===e.substr(-5)?fetch(e).then(function(e){return e.text()}).then(function(e){return[[],function(n){return{execute:function(){n("default",JSON.parse(e))}}}]}):new Promise(function(r,o){let i;function c(n){n.filename===e&&(i=n.error)}window.addEventListener("error",c);const u=document.createElement("script");u.charset="utf-8",u.async=!0,u.crossOrigin="anonymous",u.addEventListener("error",function(){window.removeEventListener("error",c),o(Error("Error loading "+e+(n?" from "+n:"")))}),u.addEventListener("load",function(){window.removeEventListener("error",c),document.head.removeChild(u),i?o(i):r(t.getRegister())}),u.src=e,document.head.appendChild(u)})},e&&"function"==typeof importScripts&&(s.instantiate=function(e){const n=this;return new Promise(function(t,r){try{importScripts(e)}catch(e){r(e)}t(n.getRegister())})}),s.resolve=function(e,n){const o=function(e,n){if(-1!==e.indexOf("\\")&&(e=e.replace(r,"/")),"/"===e[0]&&"/"===e[1])return n.slice(0,n.indexOf(":")+1)+e;if("."===e[0]&&("/"===e[1]||"."===e[1]&&("/"===e[2]||2===e.length&&(e+="/"))||1===e.length&&(e+="/"))||"/"===e[0]){const t=n.slice(0,n.indexOf(":")+1);let r;if(r="/"===n[t.length+1]?"file:"!==t?(r=n.slice(t.length+2)).slice(r.indexOf("/")+1):n.slice(8):n.slice(t.length+("/"===n[t.length])),"/"===e[0])return n.slice(0,n.length-r.length-1)+e;const o=r.slice(0,r.lastIndexOf("/")+1)+e,i=[];let c=-1;for(let e=0;e<o.length;e++)-1!==c?"/"===o[e]&&(i.push(o.slice(c,e+1)),c=-1):"."===o[e]?"."!==o[e+1]||"/"!==o[e+2]&&e+2!==o.length?"/"===o[e+1]||e+1===o.length?e+=1:c=e:(i.pop(),e+=2):c=e;return-1!==c&&i.push(o.slice(c)),n.slice(0,n.length-r.length)+i.join("")}}(e,n||t);if(!o){if(-1!==e.indexOf(":"))return Promise.resolve(e);throw Error('Cannot resolve "'+e+(n?'" from '+n:'"'))}return Promise.resolve(o)}}();
\ No newline at end of file
diff --git a/dist/s.min.js.map b/dist/s.min.js.map
index 6a14e1de..08fa45b8 100644
--- a/dist/s.min.js.map
+++ b/dist/s.min.js.map
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\ No newline at end of file
diff --git a/dist/system.js b/dist/system.js
index f60007a0..e2ad706f 100644
--- a/dist/system.js
+++ b/dist/system.js
@@ -1,5 +1,5 @@
 /*
-* SystemJS 4.0.0
+* SystemJS 4.0.1
 */
 (function () {
   const hasSelf = typeof self !== 'undefined';
@@ -471,12 +471,6 @@
    * Supports loading System.register via script tag injection
    */
 
-  let err;
-  if (typeof window !== 'undefined')
-    window.addEventListener('error', function (e) {
-      err = e.error;
-    });
-
   const systemRegister = systemJSPrototype.register;
   systemJSPrototype.register = function (deps, declare) {
     err = undefined;
@@ -485,7 +479,7 @@
 
   systemJSPrototype.instantiate = function (url, firstParentUrl) {
     const loader = this;
-    if (url.endsWith('.json')) {
+    if (url.substr(-5) === '.json') {
       return fetch(url).then(function (resp) {
         return resp.text();
       }).then(function (source) {
@@ -495,19 +489,30 @@
       });
     } else {
       return new Promise(function (resolve, reject) {
+        let err;
+
+        function windowErrorListener(evt) {
+          if (evt.filename === url)
+            err = evt.error;
+        }
+
+        window.addEventListener('error', windowErrorListener);
+
         const script = document.createElement('script');
         script.charset = 'utf-8';
         script.async = true;
         script.crossOrigin = 'anonymous';
         script.addEventListener('error', function () {
+          window.removeEventListener('error', windowErrorListener);
           reject(Error('Error loading ' + url + (firstParentUrl ? ' from ' + firstParentUrl : '')));
         });
         script.addEventListener('load', function () {
+          window.removeEventListener('error', windowErrorListener);
           document.head.removeChild(script);
-          // Note URL normalization issues are going to be a careful concern here
+          // Note that if an error occurs that isn't caught by this if statement,
+          // that getRegister will return null and a "did not instantiate" error will be thrown.
           if (err) {
             reject(err);
-            return err = undefined;
           }
           else {
             resolve(loader.getRegister());
diff --git a/dist/system.min.js b/dist/system.min.js
index 239e3c17..84d0eade 100644
--- a/dist/system.min.js
+++ b/dist/system.min.js
@@ -1,4 +1,4 @@
 /*
-* SystemJS 4.0.0
+* SystemJS 4.0.1
 */
-!function(){const t="undefined"!=typeof self,e=t?self:global;let n;if("undefined"!=typeof document){const t=document.querySelector("base[href]");t&&(n=t.href)}if(!n&&"undefined"!=typeof location){const t=(n=location.href.split("#")[0].split("?")[0]).lastIndexOf("/");-1!==t&&(n=n.slice(0,t+1))}const o=/\\/g;function r(t,e){if(-1!==t.indexOf("\\")&&(t=t.replace(o,"/")),"/"===t[0]&&"/"===t[1])return e.slice(0,e.indexOf(":")+1)+t;if("."===t[0]&&("/"===t[1]||"."===t[1]&&("/"===t[2]||2===t.length&&(t+="/"))||1===t.length&&(t+="/"))||"/"===t[0]){const n=e.slice(0,e.indexOf(":")+1);let o;if(o="/"===e[n.length+1]?"file:"!==n?(o=e.slice(n.length+2)).slice(o.indexOf("/")+1):e.slice(8):e.slice(n.length+("/"===e[n.length])),"/"===t[0])return e.slice(0,e.length-o.length-1)+t;const r=o.slice(0,o.lastIndexOf("/")+1)+t,i=[];let c=-1;for(let t=0;t<r.length;t++)-1!==c?"/"===r[t]&&(i.push(r.slice(c,t+1)),c=-1):"."===r[t]?"."!==r[t+1]||"/"!==r[t+2]&&t+2!==r.length?"/"===r[t+1]||t+1===r.length?t+=1:c=t:(i.pop(),t+=2):c=t;return-1!==c&&i.push(r.slice(c)),e.slice(0,e.length-o.length)+i.join("")}}function i(t,e){return r(t,e)||-1!==t.indexOf(":")&&t||r("./"+t,e)}function c(t,e){var n={};for(var o in t){var c=t[o];"string"==typeof c&&(n[r(o,e)||o]=i(c,e))}return n}function s(t,e){if(e[t])return t;let n=t.length;do{const o=t.slice(0,n+1);if(o in e)return o}while(-1!==(n=t.lastIndexOf("/",n-1)))}function u(t,e){const n=s(t,e);if(n){const o=e[n];return null===o&&t.length>n.length&&"/"!==o[o.length-1]&&console.warn("Invalid package target "+o+" for '"+n+"' should have a trailing '/'."),o+t.slice(n.length)}}const l="undefined"!=typeof Symbol,f=l&&Symbol.toStringTag,d=l?Symbol():"@";function a(){this[d]={}}const h=a.prototype;let p;h.import=function(t,e){const n=this;return Promise.resolve(n.resolve(t,e)).then(function(t){const e=function t(e,n,o){let r=e[d][n];if(r)return r;const i=[],c=Object.create(null);f&&Object.defineProperty(c,f,{value:"Module"});let s=Promise.resolve().then(function(){return e.instantiate(n,o)}).then(function(t){if(!t)throw Error("Module "+n+" did not instantiate");const o=t[1](function(t,e){r.h=!0;let n=!1;if("object"!=typeof t)t in c&&c[t]===e||(c[t]=e,n=!0);else for(let e in t){let o=t[e];e in c&&c[e]===o||(c[e]=o,n=!0)}if(n)for(let t=0;t<i.length;t++)i[t](c);return e},2===t[1].length?{import:function(t){return e.import(t,n)},meta:e.createContext(n)}:void 0);return r.e=o.execute||function(){},[t[0],o.setters||[]]});const u=(s=s.catch(function(t){throw e.onload(r.id,t),t})).then(function(o){return Promise.all(o[0].map(function(r,i){const c=o[1][i];return Promise.resolve(e.resolve(r,n)).then(function(o){const r=t(e,o,n);return Promise.resolve(r.I).then(function(){return c&&(r.i.push(c),!r.h&&r.I||c(r.n)),r})})})).then(function(t){r.d=t})});return u.catch(function(t){r.e=null,r.er=t}),r=e[d][n]={id:n,i:i,n:c,I:s,L:u,h:!1,d:void 0,e:void 0,er:void 0,E:void 0,C:void 0}}(n,t);return e.C||function(t,e){return e.C=function t(e,n,o){if(!o[n.id])return o[n.id]=!0,Promise.resolve(n.L).then(function(){return Promise.all(n.d.map(function(n){return t(e,n,o)}))})}(t,e,{}).then(function(){return function t(e,n,o){if(o[n.id])return;if(o[n.id]=!0,!n.e){if(n.er)throw n.er;return n.E?n.E:void 0}let r;return n.d.forEach(function(i){try{const c=t(e,i,o);c&&(r=r||[]).push(c)}catch(t){throw e.onload(n.id,t),t}}),r?Promise.all(r).then(i).catch(function(t){throw e.onload(n.id,t),t}):i();function i(){try{let t=n.e.call(m);if(t)return t=t.then(function(){n.C=n.n,n.E=null,e.onload(n.id,null)},function(t){throw e.onload(n.id,t),t}),n.E=n.E||t;n.C=n.n,e.onload(n.id,null)}catch(t){throw e.onload(n.id,t),n.er=t,t}finally{n.L=n.I=void 0,n.e=null}}}(t,e,{})}).then(function(){return 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\ No newline at end of file
diff --git a/package.json b/package.json
index f908e1e7..f5135d3b 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "systemjs",
-  "version": "4.0.0",
+  "version": "4.0.1",
   "description": "Dynamic ES module loader",
   "repository": {
     "type": "git",