I haven't had any problems with 1.2.1, I used 1.3RC2 for a while, but for some reason, every disc I made turned out to be bad. By bad I mean it would be awful slow to install and run and stuff. So I just went back to 1.2.1 and haven't had any problems since. I have a feeling, that with 1.3RC2, I was removing something I shouldn't have because no one else was having the problem that I could find in the forums. But, as I have always done, test before you burn. Use Virtual PC 2007 or VM Ware or Virtual Box. Don't just burn, you risk wasting discs that way