PHP Snippet based on arguments and user roles. Not working — why?

I have this in my Destination PHP snippet settings, and "Preserve Destination" unchecked

if (arg(1)=='add' && arg(2) == 'nodetype1') { // first check if we're on a particular page
	return 'node/add/event2012';
}
else { // if not, check by user
	global $user;
	if ($user->uid == '1') {
		return 'admin';
	}
	elseif  (in_array('role1', $user->roles)) { 
		return 'hosted-events/' . $user->uid;
	}
	elseif (in_array('role2', $user->roles)) {
		return 'dashboard';
	}
	else  {
		//return to previous login
		return $_REQUEST['q'];
	}
}

I have "redirect conditions" set to "always".

It seems that no matter what, the login always seems to redirect back to the original page.