DVDFab HD crashes on start

Hi, I’ve just installed DVDFab HD Decrypter version beta. When I start the program it comes up with a window stating my evaluation period has expired but has a button on it stating ‘start DVDFab HD Decrypter’.

When I press it the main screen comes up and the program starts to scan a DVD in my drive but then crashes immediatly.

Any ideas?

a different DVD in the drive
no DVD in the drive, go to Common Settings->Read, disable read ahead cache

Many thanks, turns out it does this with just a few DVD’s, most are fine.