It's been mentioned on the vB site, but I couldn't find a resolution for it, as it seems to affect different users in different ways.

A couple things that they mentioned to their users:

- Make sure that you allow the page to load fully before clicking the View First Unread link.
- Try clearing out your browser's cache, in case there's something corrupted in there.

You mentioned "Recently...". Is this something that just started happening to you?