Okey, I inserted the values manually into the database and ran a new "usergroup" update, but again I got the same error and all the content of this table was erased:
MySQL error reported!
Query: REPLACE INTO pp_usergroups (groupid,groupname,modaccess,cpaccess,uploads,comments,diskspace,uploadsize,editpho,editposts) VALUES(910,'FFAK (Foren. For Alkohol. Kinosjefer)','0','0','0','0','0','0','1','1')
Result: Unknown column 'diskspace' in 'field list'
Database handle: Resource id #7
I "fixed" it by adding the diskspace, but then I had to manually insert the "admin" user again... This is kinda "non-user-friendly" I would say....?