I have a MacBook Pro running Leopard, I never had a problem burning any type of cds using ITunes until now. I have tried many different things such as: 1. Dropping the burn speed down to 2x and 1x. 2. Updating ITunes. 3. Cleaning the CD drive laser. 4. Checking the drive with a non burned cd to make sure it works. Any one have any clues as to what is causing the problem?