Cannot come out of screen saver mode by tapping a key or spacer or mouse pad. The only way I have found is to do a Control-Alt-Delete, and when that screen comes up, cancel it. Screensaver goes away. I use my photos as a slide show for my screensaver. This is a relatively new problem. I suspect an update did something maybe? I did not set my screensaver to never turn off; wouldn't even know how to do that if I wanted to.
Thanks for any ideas here.