321When ESE is installed, certain default Document Types are created.  There are probably more than 50, I have never counted them to be sure, but there are too many.

If you try toinactvate them, you will find that the checkmark may not be unchecked.  Your solution is to go into the SQL Table and run a script, allowing the check mark to be made editable.

You will need to go to the table “BacoDiscussionFixedTypes” and set SystemType = 0 if any of them are the value 1.