This is a very odd problem. You might look through the 1clickdvd subforum here in the Copy Movie forum and see if there is anything similar posted.
In the meantime, you might try decrypting and ripping to the hard drive with DVDFab HD Decrypter. It is the free section of DVDFab and will continue to function even after the trial expires. See if that helps, in case this movie is simply not being decrypted properly by your regular programs.