I'm having problems with my MacBook, at first I thought it was a faulty drive, and Apple accepted to change it for a new one under AppleCare. But I am still under the same problem. I can read any original DVD or CD I introduce (movies, music CDs, etc.), I can also burn a movie with iDVD when I introduce a blank DVD. But after I finish burning, if I introduce the DVD again it won't read it. Funny thing is that someone gave me a burned DVD and I was able to read it. What could be causing this? I swear that this started after Leopard, so I am really starting to think this is software related. BTW, the DVDs I am using are Sony DVD +RW.