diff --git a/lib/quintus.js b/lib/quintus.js
index fb826523..cdbd9257 100644
--- a/lib/quintus.js
+++ b/lib/quintus.js
@@ -1148,13 +1148,20 @@ var Quintus = exportTarget[key] = function(opts) {
    @for Quintus
    @method Q.component
    @param {String} name - component name
-   @param {Object} metehods - hash of methods for the component
+   @param {Object} [methods] - hash of methods for the component
+   @param {Component || string} [base] - base Component to extend
   */
-  Q.component = function(name,methods) {
+  Q.component = function(name,methods,base) {
     if(!methods) { return Q.components[name]; }
     methods.name = name;
     methods.componentName = "." + name;
-    return (Q.components[name] = Q.Component.extend(name + "Component",methods));
+    var Comp;
+    if(base) {
+      Comp = Q._isString(base) ? Q.components[base] : base;
+    } else {
+      Comp = Q.Component;
+    }
+    return (Q.components[name] = Comp.extend(name + "Component",methods));
   };
 
 
@@ -1745,11 +1752,13 @@ var Quintus = exportTarget[key] = function(opts) {
         fileExt = fileParts[fileParts.length-1].toLowerCase();
 
     if(document.location.origin === "file://" || document.location.origin === "null") {
-      if(!Q.fileURLAlert) {
-        Q.fileURLAlert = true;
-        alert("Quintus Error: Loading assets is not supported from file:// urls - please run from a local web-server and try again");
+      if (!(window && window.process && window.process.type)) { // otherwise we're probably using electron so it's OK
+        if(!Q.fileURLAlert) {
+          Q.fileURLAlert = true;
+          alert("Quintus Error: Loading assets is not supported from file:// urls - please run from a local web-server and try again");
+        }
+        return errorCallback();
       }
-      return errorCallback();
     }
 
     request.onreadystatechange = function() {
diff --git a/lib/quintus_audio.js b/lib/quintus_audio.js
index 817a9a0a..f1c2ac6d 100644
--- a/lib/quintus_audio.js
+++ b/lib/quintus_audio.js
@@ -69,6 +69,8 @@ Quintus.Audio = function(Q) {
       source.connect(Q.audioContext.destination);
       if(options && options['loop']) {
         source.loop = true;
+        source.loopStart = options['loopStart'] || 0;
+        source.loopEnd = options['loopEnd'] || 0;
       } else {
         setTimeout(function() {
           Q.audio.removeSound(soundID);
diff --git a/lib/quintus_sprites.js b/lib/quintus_sprites.js
index 37403abb..f6b17174 100644
--- a/lib/quintus_sprites.js
+++ b/lib/quintus_sprites.js
@@ -678,7 +678,9 @@ Quintus.Sprites = function(Q) {
       this.trigger('prestep',dt);
       if(this.step) { this.step(dt); }
       this.trigger('step',dt);
-      Q._generateCollisionPoints(this);
+      if(this.p.points) {
+        Q._generateCollisionPoints(this);
+      }
 
       // Ugly coupling to stage - workaround?
       if(this.stage && this.children.length > 0) {