Ctrl+D has 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 Ctrl 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?