I am on Windows 7, IE 8.0.7600.16385
It is extremely frustrating. Yammer used to work a while back. then it stopped working. Then it came back. Now it doesn't work anymore. The Gotomeeting.com URL also used to work but now no longer does. It's not a problem with the yammer site - there's something about my computer that's preventing these specific, random websites to not work.