OK, Craigy, understand how you come to AnyDVD + DVDdecrypter use now.

Personally there hasn't been anything that DVDdecrypter hasn't worked through.

I also use other options, CloneDVD2 & DVDShrink. As my DVDrw drive only does DVD5 discs & haven't felt that it's worth buying a DL one because of the price of media. CloneDVD2 requires a CSS free readable source so AnyDVD would work if I enounter your issues.
My usage is primarily to create backup copies for my 6 & 8 yr old "cherubs" so recompression of the movie isn't a heavy consideration.