[Mark.B]

It shouldn't be like that, it's not an optimal setting to have.

If that's set to yes, then you need to speak to your host. There is some sort of caching going on and it's breaking your forum.

You should also disable plugins via config.php just to make sure it's not a rogue add-on causing problems:

To disable the plugin/hook system completely, edit includes/config.php and add the following code:
Just below

<?php

enter

define('DISABLE_HOOKS', true);