We had an annoying little problem with Flash Builder Burrito with the Problems View Stealing the focus with a bunch of warnings every time  "Design Mode could not load" XXXX.swc. It may be incompatible with this SDK, or Invalid. (DesignAssetLoader.CompleteTimeout). Although we were unable to find a way to resolve these errors, we could make them go away by disabling the design view altogether. You can do this by going into Window-> Enable Design View. 

Who needs the design view anyway?? MXML all the way!

HAPPY NEW YEAR from all of us here at Flexicious!