Michael,
I have experienced this before in previous versions of PlaybackPro on earlier Mac OS versions.
– do the same videos play consistently in other programs, such as QT7 or QLab?
– were the videos created in Final Cut?
Our problem was the QuickTime “wrapper” on the file itself. Any videos exported directly from FCP at that time had something in the metadata that PlaybackPro didn’t like. We would re-save the videos in QT 7 or FFMpeg and the problem would go away.
Aaron
Atlas Production Group