Rally App SDK 2.0: Cannot load Rally.ui.cardboard.ArtifactCard when referencing /apps/2.0p3/sdk.js
===

This item fails to load because of its dependency on the Ext.Loader: https://rally1.rallydev.com/slm/panel/Rally/ui/cardboard/ArtifactCard.js?_dc=1343151803942

I have used

    Ext.Loader.setConfig({ enabled: true });

to remedy this issue. However, ArtifactCard.js is still unable to be loaded. Any insight into why this is? Should the preview 3 script not be used?