I first heard of this problem a few versions ago (platinum). I currently have platinum v.22.214.171.124 installed on 2 pcs. My older pc (hp) started this business of DMA on 02/12 with v.126.96.36.199. I had been flashing firmware foward and backward on my old, tired liteon 1633s and initially thought the DMA issue was the result of that... however after tinkering a bit, uninstalling, reinstalling on the secondary IDE controller, etc., and physically pulling and reinstalling the drive, I can find no problem...Ultra DMA Mode 2 is enabled.
For most burns, I use my newer custom pc, which does not have this issue. I have found, however, that on my older hp, if I just ignore the "Enable DMA" window (click cancel), it burns just fine, ie., there really is no DMA problem...it's just really annoying.
I'm about to update to v.188.8.131.52. I'll fool some more with this and if I figure anything out...I'll post back.