The latest builds seem to have some sort of performance issues running in windowed mode. I have noted the shaking and frame dropping when running video with these builds. Didn't happen with Eden. Seems to happen on all the different HD formats I've tried (720 and 1080) though I haven't made an exhaustive effort at testing. Didn't note on a SD video. Also works fine in fullscreen mode.
Have found this problem on a MacAir, a MacbookPro, and a Mac Mini (all circa Fall 2011 computers).
Have found this problem on a MacAir, a MacbookPro, and a Mac Mini (all circa Fall 2011 computers).