Problem seems to be solved. Apparently, the server can be set in this mode with:

EXEC master.dbo.sp_MS_upd_sysobj_category 1

and restored with

EXEC master.dbo.sp_MS_upd_sysobj_category 2

see:

http://www.dbforums.com/archive/index.php/t-356511.html

cheers and thanks for reading 🙂

/Linus