It used to work and now when I press F12 nothing happens...the window does NOT appear. I've uninstalled any other toolbars I've installed and tried resetting by security settings in IE...nothing.
I'm using Windows 7 beta
Maybe someone disabled them?
Here's how you do that.
Basically: Check the following registry key:
HKCU\Software\Microsoft\Internet Explorer\IEDevTools
In the worst case you can remove the whole key. This wil revert the settings back to default.