Autodesk Discussion Groups and IE9

If you have "upgraded" Internet Explorer to Version 9 and have suddenly found that your posts in the Autodesk Discussion Groups are showing up with a blank message body, try turning on Compatibility View.

Supposedly, there is a button for this at the end of the Address Bar, but I did not have one.
I had to turn on the Menu Bar (which I would have done, anyway) and then chose Tools > Compatibility View while the Discussion Group site was up on the active tab, and then I was able to post a reply and have the text show up.