Adam, I don't know whether others have experienced this "quirk" since the vB 3.7 update, but it's been happening to me.

Sometimes (not always) when opening a new session on the Forums, and even when moving from one Forum to another in a single session, the bold highlighting of unread threads goes missing on the Forum page(s). If that is happening, the "view first unread" link on threads also go missing on pages where there are unread postings. This behavior did not appear prior to the update, if that helps.

I use Apple's Safari (current version 3.1.1) under MacOS 10.4.11. Occasionally, I'll run the current Firefox, but not often.