If I visit the webiste as a Guest and I click on 'Mark All Post As Read' located near the end of the forum it does not mark any of the post as read, it still shows them as NEW posts. This is only happening on version 2.3.4 as it did not do this on the previous version of 2.3.3 any ideas as to why this is happening.

It's becuase for 3 straight releases now they have been messing with that area of coding. I really wish it would get taken care of becuase each version has some form of read/unread error still.

Notes:
1. post this in the bug tracker.
2. I just confirmed it is indeed a true bug.

Does it do it as a member? If not then I am guessing it will be an easy fix...

I wasn't aware that Guests can mark All as read. Does this mean I can Mark All as Read for other Guests? Don't think so.

You can as a guest yourself though. I think it's always been that way. I guess it sets up a cookie to do it becuase I am pretty sure I've marked them as read before.

Guests are assigned sessions, so you can mark posts as read as a guest.

Ok I have submitted it to the bug tracker for review.

Check your cookie settings I can't duplicate on my 2.3.4 board.

I duplicated on mine though and I think my cookie settings are what bfarber suggested people use.

Bugs should be posted in the bug tracker. As it has been already (according to a post above this) I'll close this topic now and we can address the issue through the bug report.