Although i'm pretty new to this (just saved my entire CD collection) to mp3 mode.
After reading your post I clicked on WMP & it opens up with the list of items saved.
All I did was drag any title across from the list to the Play List on the right,,,,, it started playing immediately,,,, even whilst I was adding toons to play.
hope this helps.
Incy dentally - do you know if can I copy my saved mp3 files back to (i assume) WAV files to play in normal CD players ?