Make sure in your admin file there is not a space after the group name "[Example]", not "[Example] ". If you have no space on the end, try replacing this line
PHP Code:
if ( !bDone && !bInGroup && ( equali( szBuffer , szAdminGroup , iLineLen - 1 ) || equali( szBuffer , szAdminGroup , iLineLen - 2 ) || equali( szBuffer , szAdminGroup ) ) )