I had a similar problem with my Plextor PX40TS (the SCSI CD-ROM). It'd bail on the last track. Strangely, I'd not changed any of the driver software at all, as far as I can tell.

I switched over to using a Teac CD-ROM in my other computer.

Try giving Plextor a call/mail. Last time I tried (about a different issue), they were quite helpful.

Oh, and let me know if you have any success -- those things rip faster than anything else I've ever used.