Toast 4.1.1 Disk-at-Once problem may extend beyond Que! drives

Regarding our previous report of problems with Toast 4.1.1 especially with Que! FireWire CD-RW drives: William Merz confirms: "After having the same problem with Disk-at-Once in Toast 4.1.1, I switched back to Toast 4.1 (Deluxe not OEM) and am able to write again in DAO mode. Of course you lose Burn-Proof." Carlos Macia adds: "Toast 4.1.1 Disc-At-Once seems to be having problems with more than just FireWire drives. I have a LaCie 16x4x6 SCSI drive and the burn fails when Disc-At-Once is invoked. The burn process fails with "buffer underrun". Even if I lower the write speed, it fails as well. If I do not invoke Disc-At-Once, by forcing all the pauses to be 2 sec. between tracks, the burn is successful at all speeds. I never experienced problems with Toast 4.1 either. This started happening after upgrading to 4.1.1, which automatically invokes Disc-At-Once when duplicating an audio CD if any of the pauses is other than 2 sec." Fred Stratton writes: "I have exact same problem as Remi with my Sony CRX510E mechanism sold for the iMac as an internal ATA replacement by TechWorks." This problem is not yet listed on Adaptec's Toast 4.1.1 Known Issues page.