You didn't say whether it was the blu ray or standard DVD, nor what edition of this disk you had a problem with. There are 2 different blu ray versions (one is a 2 disk package -- one blu ray and one standard DVD). There are also 2 different standard DVD editions (one is the unrated extended version and the other is the theatrical vesion). I've seen posts where people have a problem with one version and not the other of other movies using the same version number of DVDFAB.
Anyway, DVDFAB 8.0.50 backed up the theatrical version fine for me.