Firstly, I apologise if this is a pebkac issue.
Usually when I come to the forums, I check View your posts
and View posts since last visit
for any interesting posts. However, sometimes, apparently randomly, after refreshing the above pages, posts I have just read appear as "New Posts" (orange icon), so I think, "oh, someone's posted something else" and check it again; in actual fact, nothing new has been posted, yet it is still marked as unread.
Is this a bug with the forum, user, ISP cache... ?
I'm using Firefox 18.104.22.168; any other relevant info I'll happily provide.
Oh, and it also happens with the forum index. And the post links on the left, under "On the forums // Latest Posts" are marked as unread (orange) until I log out/in - even my posts, odd, no?!