I have another problem with MediaPlayer 0.7.1/iOS 4.3 (latest), newest Sea0nPass: I regularly lose the afp connection, sometimes right after playing a movie, sometimes right in-between, the latter happens especially when it has been paused for a while. I tried it with a different mac as source for the files, I also tried a different router. Both didn’t help. With my previous installation, which was the IOS version before the current 4.3 (can’t remember the exact version number) and MediaPlayer 0.7, everything worked flawlessly.
When I lose the connection, it helps to go back to the main menu and selecting the media file again most of the time. In rare cases, I got an error message about a file called “com.firecore.afp…” (not sure about the exact filename). Then, only a reboot helps.