My RL is not recognizing any MP3 discs. I've tried both CDR and CDRW. I'm using Nero to create them. The Audio menu displays the MP3 disc icon correctly on the Disc number, so it knows that it is an MP3 disc. But when I attempt to play it, I get nothing. The word "DISC" just keeps flashing on and off inside the mini-display above the dash where the clock and climate indicators are. Any ideas??