I have used the excellent PicVideo MJPEG codec for about a year now with great success. After installing Pinnacle Studio 9 (possibly co-incidence) my MJPEG encoded AVI files show only a blank screen in Media Player, Real Player, and some other programs. They still work fine in VirtualDub and TMPGEnc, and the audio plays in everything. Also, AVIs compressed with other codecs don't have this problem.

What could have gone wrong with the MJPEG codec to show a blank screen in some programs? My OS is XP. I tried to check the settings and re-install the codec, but it didn't fix the problem. Is there a setting that Pinnacle Studio could have changed that made this happen?