I'm having a multitude of ordeals with this thing. I recently wiped my music and synced my Winamp library with the PSP (put them in MUSIC/LIBRARY) so it could name the files for me. Trouble is after scanning the MS multiple times, FLAC files arn't identified as having any tags, when they clearly do, they are all in a unnamed list. Also some sets of mp3's are scanned with tags which I used before the wipe, and that is totally mind boggling!
When I look at the files on the comp, none of these anomalies are present. By the way, I compressed the FLAC files as much as possible. Last but not least some mp3's formats are labeled as "MP3 layer 1" while others "MP3 layer 3" what does that mean and sometimes I have to manually switch tracks at the end if it's a layer 1. I'd also really like to know the file naming limitations.
:edit Using 3.90m33-3 and meant to post in help, my bad .