Not sure what has happened, but a few months ago my keyboard shortcuts stopped working in PS CC. For example, I have to go to Layer--> New Layer via Copy to create a new layer. Some shortcuts work sporadically, but not always. Control-Alt-Shift-E doesn't usually register correctly, and turns my blend mode to Difference. Or it will simply open up the Edit menu from the drop down menu bar.
Why are my keys not working correctly in Photoshop?

