I've been able to reproduce this "bug" consistently, even after restarting the app. Basically, after using a moving background and taking a couple pictures, all of a sudden the hue shifts and everything is greenish / yellowish. At that point, nothing works properly, and a shift+command+r doesn't reset the background theme. And these are not custom themes, these are the apple ones.
Oh, and yes, I have an intel mac (C2D SR 2.2).
Oh, and yes, I have an intel mac (C2D SR 2.2).