In another topic someone posted 'bring back the ignore button', Gary asked me to look into it. Not sure what that is, there are two core features that allow members to ignore boards or other members:
Ignore Boards Option
This page lets you ignore particular boards. When a board is ignored, the new post indicator will not show up on the board index. New posts will not show up using the "unread post" search link (when searching it will not look in those boards) however, ignored boards will still appear on the board index and upon entering will show which topics have new posts. When using the "unread replies" link, new posts in an ignored board will still be shown.
Buddies/Ignore List
This area allows you to maintain your buddy and ignore lists for this forum. Adding members to these lists will, amongst other things, help control mail and PM traffic, depending on your preferences.
I've enabled both, you can see them in your Profile. Never used them, so not sure how they work, but Ignore Boards seems pretty straightforward. Ignore List seems to have mostly to do with controlling PMs. There are several old mods that add some additional ignore functions, if I knew what you had here may be able to reinstall it.