When I launch avatar it automatically rotates the screen and then stays that way to display the drm warning. Not really a fix, more of a bug you could take advantage of of you just want it rotated for games. As a real solution I would recommend launcher pro.
Sent from my Vibrant
Android Collection: Galaxy Nexus, Thunderbolt, Fascinate, Vibrant, Droid Incredible, Nexus One, MyTouch Slide, Cliq, G1