I am only running 3.7 beta 2 on my test site and a lot of the javascript you have on your page is not on mine. Create a new skin with no parent. This will create a totally default vbulletin skin. Then click on it to view your forum with that skin. Then see if this problem still persists.
If it is gone, then it is your style. If it's still a problem, then try disabling your modifications one-by-one and seeing if the problem goes away. If it does, then it is a modification.
As for the other error... I have seen it mentioned over on vbulletin.com - try doing a search over there. I can't remember if they figured out if it was caused from a hack or not, but I think so.
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