Hi Jeff,
I'm using Toad for DB2 z/OS version 6.2 and beta 6.3. I've been having this problem with a specific table for a while. I'm not sure that the security guys will let me send the DDL's out.
Another interesting behavior that I have found is that when adding a table the the query builder, it often adds two relations to an existing table in the window. I usually want to keep one of the relations. When I click on one of the lines to remove the relation, 9 out of 10 times it removes the relation that I wanted to keep. It doesn't matter on which line I click.
If you would like, I probably could set up a Webex to demonstrate these behaviours.
Sincerely,
Shimon J.