OK if it is a test server (and only a test server !) please try to use the root account (NEVER do that under production environment).
SQL is sometimes a bit tricky to understand.. not only read/write/modify the database, XOT should also have scheme roghts as far as i remember...
Root account has all rights !
As you can read here, i hardly suspect an issue regarding DB rights ....
I really hope you'll soon get rid of your issue.
If I can help I will do for sure...