No memory errors. Must be a software conflict I haven't been able to figure out.
Burning Rom works fine, it's just showtime that doesn't.
Don't really need it. I bought a Plextor external Bluray player, with PowerDVD for playing Bluray on this machine.
The drive got good reviews, and, it's USB, which apparently is fast enough to play Bluray disks... Hasn't arrived yet.