Finder is acting strangely. In the panel where I normally see the files, I see a hodgepodge of strange things, for example my desktop photo and multiple images of the "dock" (all the icons at the bottom). Or to generalize, this panel acts like a literal window in the sense what you see in it is what is "behind" the panel. This is not 100% correct - there are distortions and other strange visual effects. In effect, the panel appears to be acting as a "camera" that captures and sometimes distorts what was on the display before Finder is invoked. What is going on? I am not a techie. And restarting does not fix the problem.