[Colin F]

You could try something like this:

in global.php, find:

	// style specified in user profile
	$styleid = $bbuserinfo['styleid'];

REPLACE WITH:

PHP Code:

    if ($bbuserinfo['styleid'] == X AND $bbuserinfo['usergroupid'] != Y)
    {
        $styleid = $vboptions['styleid'];
    }
    else
    {
    // style specified in user profile
    $styleid = $bbuserinfo['styleid'];
    } 


replace X with the styleid and Y with the usergroup that's allowed to view that style.
(untested)