If you have the time, I'd be interested to see exactly where its hanging.
Open up regedit and browse to HKEY_CURRENT_USER\Software\DVD Decrypter.
You should find an entry called 'InterfaceDebugMode'.
Set its value to 1 and then load up the program.
You 'should' see lots of commands (CDBs) flying up the screen in the log. Take note of the last few before it crashes, or if they just keep repeating, tell me which one it is.