I run RC2, and do NOT have rewrites on my server. I could not reproduce this problem here, on the live xenforum site, so I'm not sure if it's a bug or a local issue...
I go to the "What's new" page. No new messages. I click on the "view all recent threads" link. The "Threads below this have not been updated since your last visit but have unread messages." sign shows up, and lists my one and only topic below it. There is only one post in it that I posted, and I have read it many-many times. That topic is definitely not unread, and does not have any unread messages. No matter how many times I click on that thread to read it, it keeps appearing here.
On this same page, the "All Recent Messages" link does not take me to another page. It reloads the same page as "index.php?find-new/32/threads", then "index.php?find-new/33/threads", then "index.php?find-new/34/threads" etc, but I keep getting the same page back.
I tested this here, on the xenforo.com forum, and it works fine here.
Maybe the lack of rewrites makes this act funny?
Did anyone else notice this?
PS: I only have one add-on installed, and I disabled that to make sure it does not interfere.