With Perian 0.5 installed, QuickTime (at least versions 7.1.3 and 7.1.5, testen on PowerPC and Intel) is no longer able to play back or even open certain AVIs (dependent on the Codec) that were exported with QuickTime itself. Removal of the Perian component corrects the problem. This is the same problem that is addressed in Tickets #117 and #96 . We experience this problem for BMP24, BMP32, Cinepak, Indeo and WRAW / BIP.
In addition, some Codec / Fileformat combinations still play with Perian installed, but show decoding artifacts after the last frame. We experience this problem with 3gpp and mp4. After removing the Perian component, the videos play back correctly. Detailed description: the video plays fine but after the last frame, some blocks are replaced by garbage. Jumping to the last frame in QuickTime player leads to correct display, however.
I'll attach a couple of sample files for you to check.