Yup, I'm sure... Let me give you a detailed example, just to clarify a bit.

Now, the Feedback sub-forum is highlighted as there is an unread post, quite aptly being this one. So I make my way through to the unread thread. Ok, now after reading I do one of two things.

1) I click the forum button at the top to go back to the forum main page - the Feedback forum icon remains highlighted. I click through again just to check, but no new threads. I click the forum link above again, and now it shows the forum is read.

2) If I go back through to the sub-forum landing through the breadcrumb above first before going back to the main forum page, then it shows as read.

Also, I've found that if I view the different unread threads in their own tabs, it doesn't mark them as read after refreshing the main landing page.

It sounds like a caching prob to me, but no other site does it.
System: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.8.1.10) Gecko/20071115 Firefox/2.0.0.10

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