Prolific 3507 Firewire Chipset

I have a firewire enclosure with the Prolific 3507 Chipset. Inside of this case is a Lite-On LTR-52246S (52X) CDRW drive. I used to have an Oxford 911 chipset case and everything was fine. Now, in certain applications, namely Sony CD Architect 5.0A, my drive is not recognized. In fact, it takes more than 5 minutes just for the burn CD dialog to be displayed. Nero works just fine so far. I enabled the SCSI drive option in the program.

Where can I find the latest firmware for this chipset? Any info on how I can get this to fully work?