(Solved) Group permissions not saving

When I try to change the group permissions, the admin-cp login-screen appears and the changes aren't saved. Beside this everything works.

Is it possible to make a little change in the .xml-file so that the permissions are from the beginning "Can view and play" for all usergroups?

$vbulletin->db->query_write("ALTER TABLE " . TABLE_PREFIX . "usergroup ADD arcade_access TINYINT( 1 ) DEFAULT '1' NOT NULL");

Here maybe?

Or can I change the group permissions via a query?

Like I said it would be no problem if all usergroups have access and can play. I just want to make it work.

--------------- Added [DATE]1228137577[/DATE] at [TIME]1228137577[/TIME] ---------------

problem solved. i changed it to "DEFAULT '2'" and it works. i just forgot to make the same change in the .xml file in the includes-xml folder.