Threads always show as unread in Networking forum

[AnonymouseUser]

Just started today, and I have no problems with other forums showing as read. For example, here's my User CP now:

Hasn't cleared since I replied to that thread, no matter how many times I visit it. Off Topic forum does not have this problem. All threads in the Networking forum are the same right now, won't show as read. Any clues?

Edit: this is using the latest Firefox, btw.

 

[AnonymouseUser]

Doing the same for this forum:

 

[AnonymouseUser]

I've just confirmed this behavior does not exist in Opera. I restarted Firefox but the issue persists. I will delete my Anandtech cookies and/or delete cache to see if that helps.

Edit: Deleted Anandtech cookies and that cleared it up. :hmm: Mods, please delete.