Weird loading problem at "autoDetectRenderer"...

I went to fully clear my browser history in Chrome and then my game wouldn't Init successfully. It started throwing an error here. The undefined error traced back to Pixi.js line 16. It also wouldn't Init in Firefox. I restarted my PC, and, it still wouldn't init... Then I loaded one of the samples successfully, now everything is working again without any code changes.

Wtf? Gotta love HTML5... Anyone ever had anything like that happen?

/** Create a Pixi stage and Renderer **/
var stage = new Container(),
    Renderer = autoDetectRenderer(windowWidth,windowHeight);
document.body.appendChild(Renderer.view);