It's not just itunes. tunebite isn't working right for napster wma files in wmp10. It cuts off about 15sec or so from every file.

Actually I dont even use tunebite with itunes since it's pretty easy to rip the copy protection off the files with jhymn.

Itunes has NO problem reading mp3 files. It'll play any and every mp3 you can throw at it just the same any other play along with many others. I use it because I have an ipod.