I finally got the Toaster/Flyer software reinstalled. I ran full read/write tests on my Flyer 50GB drives (took three full days) followed by reformatting, and still have the same problem. The tests gave different results for each drive, which tells me my old scsi drives that I got used might need to go. When originally formatted several years ago, the tests yielded consistent results across all three drives. That being said, I have found that I am able to consistently play back a project if I do a soft reboot after booting up the first time (hitting the reset button on the A4000T). I don't know if this speaks to an issue with initialization of the Toaster/Flyer and the drives. In any event, doing a soft reboot works every time.