Did he maybe move the user group class into the content class group?
Also check what templates are called now for displaying the user group - maybe your client deleted the user group class and created a new one which leads to another class id and possible problems in the override.ini
Yes, shortly after i posted this message I found the user group class had got moved. Now the issue is that the content/info for previous User Groups that got created before the User Class move still don't show. If you now create a new User Group it's info shows fine...
Well I guess in the worst of cases I can just recreate all the User Groups of course except: Registered, Guest, Admin and Editors.
