Running Internet Explorer v9.0.8112.16421 on Windows 7 Pro x64 with SP1.
When the browser is asked to open a page in a new window or tab, the new blank window or tab appears, but nothing loads. There is a spinning circle in the address bar and along side the mouse cursor, but nothing more happens.
This behavior is observed whether you click on a link using target="_blank" or right click on a link and select open in new window. I have also uninstalled and reinstalled IE9. I have also experimented with the IE tabbed browsing settings including disabling tabbed browsing.