FYI I went ahead and added that meta tag and Ken pushed it out with BI 4.7.4.2 this morning and I'm 90% sure that would have fixed it too (90% is about as sure as I can get with Internet Explorer).
In my tests, IE will consider the site an "intranet site" and want to use compatibility view if you use a local computer name in the address bar, but a local IP address seems to not trigger that behavior.