You might want to check what I/O drivers each program is using. There are about a half dozen common ones that define how the program interfaces with the burner. ASPI is a common one, but SPTI is probably a better bet if you use Windows XP. Nero, Blindwrite, and a few other burning programs all have their own custom ones as well.
Given that all other variables have remained the same, I would check this issue out first. It could be improper formatting by DVDFab Platinum, but you should still be able to see the files in windows explorer if that were the case.