I have been using iDVD for over a year now and it suddenly stopped burning to DVD's. I know that it has nothing to do with DVD's themselves. When it is burning to a disc it goes through all the processes but freezes on the last step. It says "done" but it keeps running like it isn't finished. Then when click "cancel" and eject the disc, it is blank, so it was never actually burning to the disc in the first place. I have tried this several times and the same thing keeps happening. I have no trouble burning other things to discs. It seems like it is just in iDVD where the problem is.