First of all, take a look at the logfile, dvdwizard creates. The file can be found in the directory, you called dvdwizard in and is named dvdwizard.log. You should get a hint on what is wrong there and maybe you are able to resolve the problem by yourself.

The next step: look into the mailing list on
http://sourceforge.net/mailarchive/forum.php?forum_name=dvdwizard-users