I have found that at least for the last coupla weeks, the 'mark all forums as read' feature has not been working accurately.
After I read everything I want to read, I click on that 'mark all forums as read' link in the upper right border of the main screenl and it returns me to the index. But, in a little while, when I come back to the Orchard, I click 'view new posts' and the same posts come up...they are not all new.
Anyone else experience this?
This feature used to work well.

Works fine for me. Something with you cookies?

Patrik

Working fine here... Nothing has changed on that function, so it might be a cookie issue on your end.

Its different when I used different computers. Like when I go to school and I havent been to that classroom in a week there are a lot of "New Posts" even though I had just read them at home.

Cookies are the reason for that... If you'd been on that computer before and checked the Orchard, it sets a 'cookie' on that machine (at school) with your post indicators, which do not, of course, get updated when you check the Orchard from elsewhere.