Sanyo H.264 Fixer automatically "swaps" the H.264 component from the old (7.3) QT with the new one. Nothing is changed, except it can now play videos from the SANYO XACTI HD camcorders. This is a fix for the "green MP4 of death". NOTE: If your video is choppy, it means your computer is not fast enough.
Thought this was interesting although I've never run into this problem but here's a FREE app to help out.