I have done so many tests on the 5.6, 6.0 beta, and 6.0 final, so I'm not sure if I am remembering things the right way, but I belive I had the samme issue with the 6.0 final, and that the only thing I did was to first remove the dungog package and then install it again. It come a lot of test messages during the installation that might look a bit like like error msg, but I believe that it actually apeared to work after the reinstallation.