I have two burners the Pioneer 107D with v1.21 offical firmware, and NEC 3520A with Liggy's 1.25 Beta 3 firmware.
The pioneer will not pick up that there is a DVD in the drive when I put the NEC 3520 burned dvd in the drive.
I am using ritek G05 media burned at 6x-8x
These drives are not on the same computer 2 different ones.
But the dvd movies work fine in a standalone player though.