F12 developer tools in IE9 not working for some sites
internet-explorer-9
Solution
Ok, I figured it out - the problem was that I have Google Chrome Frame installed, and that certain sites were activating it, which was effectively taking over the DOM/CSS rendering.
I didn't realize it was still there, because it wasn't showing up under Tools/Manage Add-Ons to disable. After uninstalling cleanly, everything works again.
So my own mistake with my environment.
Problem
I can launch the F12 developer tools in IE9, but for some sites, they don't do anything. The window opens but sits with the word "Loading..." in the HTML tab, and none of the controls work. Any idea what might be wrong? UPDATE I checked the network tab with Chrome and do not see any hanging requests. Further, the page itself is responsive in IE.