refresh required to read inbox messages

Since a few days ago, when the red dot appears, indicating new messages, I can't click it. I always have to refresh the page first. Previously it worked fine. It's not the end of the world, but it's annoying. Bug?

Firefox 12.0 on XP SP3.

• Workaround: Try clicking Stack Exchange instead of the red circle. May 21 '12 at 15:55
• @Dennis - That doesn't seem to be a workaround. That's a solution! :-) (And I hadn't even tried that...) May 21 '12 at 16:48