This is one I have:

Product Details: SanDisk SDMX1-256-A18 MP3 Player
Product Details Installed Memory 256 MB
Audio Format WMA DRM, WMA, MP3
Battery Life 15 hour(s)
Weight 0.06 lbs

I haven't tried the other formats yet (guess I should have) - was just looking to see if anyone had the same problems.

It's weird - I literally play the file on my mp3 player and then my computer at the same spot in the song, and can't get the computer version to "blip" like my mp3 player does.

BTW - what does WMA DRM mean? Does this mean it plays "licensed" versions of the files as well as regular wma files?