I’m having the same issue. In SharePoint 2010, when I view the feed in ie9 (checked developer tools, ie9 across the board), it does not show. The feed does, however, show in Chrome.
I opened your JSBin file from earlier and it does show the feed in IE9.
It’s been working up until a few days ago for me too, and we haven’t changed anything about our SharePoint instance.
Any thoughts?
Oh! More info. I took the code from JSBin and tried to display it in ie9 without SharePoint OR JSBin and it does not show. It only shows the “Tweets by @Interior” (Just like my “Tweets @WilmerHale” shows in SharePoint 2010.)