I use IE10, and on all of the vBulletin boards (since yesterday) I've had the following message pop up on the bottom of my browser window:
"Internet Explorer blocked this website from displaying content with security certificate errors."
It asks me if I want to Show Content, or just clear the message. I don't see any missing blocks on the webpage, so it appears everything has been loading. Not sure exactly what's triggering the error message.
Its an annoyance, vice an obstruction to the boards.