Hi K2 and welcome,
I'm still stuck at work so I can't check, but I believe Task_3 refers to the verification process...a useless process particularly with the VSO burn engine (default burn engine for Fab).
Go into Common Settings > Write and untick verify.
If this doesn't do it, please post a couple of burn logs...just copy and paste 'em right here and we'll take a look.
The default location is:
C:\Documents and Settings[I]Administrator Name[/I]\My Documents\DVDFab\Log
Does the bkup play ok?