Well, I've had exactly the same problem as FF. I quoted this post, and typed in my response, and the quote was all that got put up.
I've since switched back to IE8 as well, and it's working again (witness the way I can now edit this post).
You know, not all of us are computer geniuses. Not all of us are computer geeks or nerds, either. I, for one, spend my work day USING a computer but I no longer have any desire at all to know how the shit works behind the scenes; I'll leave THAT for you younger folks. But the most of the responses to the OP are not a lot of help. Largely, they're simply a swipe at MS (deservedly or not, I'm not going to judge), a defensive response, somebody with the "mine is better than yours" mentality, or blaming it on the operator (when many of us operators have no idea that it might be a simple security setting or, for that matter, how to turn the goddamn thing off).
How about a simple suggestion, such as "Uninstall the IE8 upgrade". Or, something like, "Google Chrome works for me". But most of the replies here were worthless. And it's one of the reasons I spend less time every day on the internet because I get tired of dealing with the "experts" out there who seem to expect everyone else to be an expert, too (unless, of course, somebody else's opinion is different from the said "expert").