I use evernote, which uses the hotkey ctrl + alt + t to open a specific window to tag notes.
At some point in time, Windows 7 stole that combination to open a system dialog "Tools for the active window". It might have been when I installed a second monitor, but I am not sure.
Can I reset the hotkey to work with Evernote again instead of opening up the "Tools" dialog?
with guenter's help, I figured out that WinSplit Revolution, a window location utility, was overiding the hotkey. In the options dialog of WinSplit I disabled the combination and regained control of Evernote's window with it.