I don't know if this has happened for anyone else, but one day Ctrl+D stopped working for me.
I use that shortcut all the time in Photoshop, Visual Studio, and many other apps... I have no clue why it would stop working.
The control key works fine by itself, so does the D key.
Even when I try to bind a macro to a hot key (Crimson Editor) it doesn't work with the Ctrl+D combination...
What is the best way to diagnose and resolve this problem?