DL's - really don't use FAB for the DL's, mainly as normally rips/burns fine with +DL (never have used -DL), often has problems on layer break...usually you can't get it to continue during playback, but certainly not seamless. Might have finally have been corrected in 220.127.116.11....but haven't tried, for these burns (and they are very infrequent), use the anydvd (cost), dvdecryptor (free), and imgburn (free).
Note the trial version is exactly the same as registered.
-Express - actually above applies to express, never see need to use gold for a DL attempt. However neither version "auto" detects DL discs - you must select that, but generally don't have to get into the "size" setting. (believe target size only in Express mode)
Also, FYI, most issues encountered are with the Full disc backups(especially recent discs) - whether via express (compressed), or DL...Main Movie only backups generally error free, and even with fair amount of compression, look very good.