The errors are happening in the DNN code, not the GSP code. That's not to say GSP isn't responsible, but there isn't anything for me to go on. Check both the GSP error log and DNN's event log - are there any additional clues that might help us out? I am especially interested in any errors where Gallery Server Pro is mentioned in the call stack or error message.
For the record, I have tested GSP in DNN 6 and - except for one issue I fixed in the
patch - didn't find any trouble.
Roger Martin
Creator and Lead Developer of Gallery Server Pro