Sounds like DRM in action. Some mp3 players CAN play wma without this 'protection' but, if your bought ones are protected, it looks as if your mp3 player can't play protected files (quite common). Can you buy them as mp3 in future?
Hi wordingham, something drastically wrong here? What quality are you using for your mp3s (128/160 or above?). Some players might not be able to play the higher bit rates (eg 320+). Could the player be faulty?