Can you try something for me? I think you may have found a bug.

IN templates/default/markallread.tpl
FIND THIS:
<form action="{ubb url="ubb=domarkallread"}">

REPLACE WITH:
<form method="post" action="{ubb url="ubb=domarkallread"}">


Test the button again (after doing a browser page refresh on the page), and see if that works for you now.

Thanks!


current developer of UBB.threads php forum software
current release: UBB.threads 8.0.1 // wip: UBB.threads 8.1.0
isaac @ id242.com // my forum @ CelicaHobby.com