I normally use the arrow keys to rotate the views in SW. I found Ctrl-Z was too close to Ctrl-S and it was annoying to hit Ctrl-Z by mistake when I intendewd to hit Ctrl-S (to save my work). Because then I had to re-do again and SW does not have a successful Re-Do. So I decided to re-assign Ctrl-Z to something like Ctrl-Q. But suddenly now my left key does not work any longer. What could have happened? Very frustrating.