Thanks, now I have the latest version … http://cloud.florianmatthias.com/boym

but still no luck … 
I have a subscriber with this caps enabled … http://cloud.florianmatthias.com/bpOT

… and I have your function in the functsion.php file.

However I log in under this user I can edit and update the 3 pages, but when clicking on media I get this … http://cloud.florianmatthias.com/bp5J (which is german for no media available)