I can't help you, but I am in the same boat. I can copy some games and the work fine, while others don't.
I know what you guys mean... I got so fed up with this always happening to me that I just started buying my backups from sites online. They're getting so cheap, it's worth it, especially when like me, you don't have much time to site there and burn all your games. My 3 favorite sites for buying my backups are: 1. www.Dreamcast-Backups.com - $3.00/each 2. www.CheapBackups.Com - $3.00/each 3. www.computerexpressonline.com - $2.00/each I know, why buy my backups of my hard copies, when I can back them up myself, but I never get any problems when someone else does it, probably because I'm not as smart as them... or they know something i don't.
Just wanted to add that I know Maxell and Phillips discs work because I've used them before... are you using cdr's or cdrw's? Personally, I've never tried a cdrw... I use the cheapest possible cd's I can buy and they seem to work...