There is an extra " in alpha11 and alpha12 in function insert_usergroups_form called from users.php and included originally in ./include/forms.inc.php
At lines starting from 707 up to 716 you have an extra escaped "
Result in a HTML error not showing all possible users that can be added to a group (it just shows a single check box).
At lines starting from 707 up to 716 you have an extra escaped "
Result in a HTML error not showing all possible users that can be added to a group (it just shows a single check box).