Keyboard shortcuts triggered when entering keywords

Every now and then, more often than should happen (should never happen), when I am entering text into the keywords field, LR thinks I am trying to use a keyboard shortcut. Often times this invokes a feature I have no idea how to exit from. Is there any way to disable this "feature"? Alternatively, is there some generic keystroke I can use to undo a keystroke shortcut? This can be extremely aggravating.

Just now it happened when I was trying to add the keyword smilax. S was retained, but M wasn't so maybe it was either s or m that triggered the shortcut. The image I was working on displayed in the center of the screen with everything else dark. I quite LR to resolve the issue.