Smush - I've played some vid clips at 24fps and 29.97fps, but can't remember the playback results. After reading the PocketMVP help file (and the rational behind the preferred 15fps encoding), I've use 15fps exclusively. These old eyes of mine can't see much difference. Everyone that sees the Axim playing music videos is quite impressed.
Tidal - are you using PocketMVP or WMP for playback? Can you play other video clips? Try my shuttle launch video with PocketMVP and see if it works.
STS-107 Launch
Jeff