In the past, the site tracked what the last post I read was on a thread, and if I clicked to go to the first unread post, that's what I'd get. I recently upgraded to Internet Explorer 9, and now the site still keeps track of my last visit and shows me threads that have new posts since then, but it won't take me to the first unread anymore. I keep having to wade through older posts (though not from the very beginning of the thread--seems to be just those since the upgrade).
I'm having this problem also. We have a new computer with Windows 7 but it worked fine for the first week, then stopped working. However, the 'last read' function works fine on other forums, but not on Chicks.
I'm having this problem too, using firefox on windows 7. I tried logging out and logging back in, but no luck. For me the "next thread" also isn't working.
Could it be a firefox add-on affecting it? Try disabling any add-ons temporarily and see if that changes it. Many add-ons are created by individuals and not firefox, so they may not be fully tested.
That's just a guess, because I've seen add-ons affect similar things on other sites.
I've having this too and I check this forum on 3 different computers that use Mac, Windows and Ubuntu and using both Firefox and Epiphany. I also keep having a lot of threads that are marked unread when I've already read them. Has anybody found a solution? This only happens on 3FC for me.