This type of thing is not an infrequent occurrence for me...and, of course, it's all my fault.
I've got my little way of working...for instance, I like to work on one large screen at a time: Track View, PRV or Console. I never have multiple views open at once. I've either set up or know the limited number of shortcuts I constantly use. And that's about it.
So, when I do screw up and accidentally hit some errant key that switches something on or changes something's appearance I'm temporarily screwed...until I either stop and take the time to look it up in the help guides or post another "yes, Virginia, I am a moron" thread here.
Humiliating, yes, but still good for the soul:-)