Read / unread thread status totally broken for anyone else?

[Shad]

Yes, I'm filing a bug report against my own site

For some time now the unread (dark green) and read (gray) circles seem to have no relationship with reality for me. The number of new posts in the main site menu is correct, but I can read an entire thread, go back to the parent forum, and it will still show as having unread messages.

Is this happening for anyone else?