I've encountered a minor issue since the upgrade. I use Norton Internet Security 2004 for virus protection and as a firewall at home and something in this version of vBulletin is triggering security alerts. Whenever I post I get the following message:
This page provides potentially unsafe information to an Active X control. As a result some portions of the page may not display correctly.
I'm still able to see the page(s) correctly as far as I can tell and it doesn't interfere with my ability to post so it's more annoying than anything. I don't have a good understanding of how Active X controls work yet, but I run the Norton software at a fairly low security level so I'm guessing that there's some potentially bad code in the current release of vBulletin. I doubt anyone can do anything about it but I'm going to report the issue to the vBulletin folks and see what they say.