After changing canvas size, marque and quick select stop working properly

So sometimes, but not always, when I change the canvas size of an image I am working on, the recatangular and oval marque tool go crazy -- flickering back and forth between two "slected" areason the screen while I am moving the cursor, then the selection turns into an area anchored near the upper left portion of the image as it shows on the screen (usually) when I release the mouse button but not coresponding to the area I selected.  Smart select is even weirder, it turns into an "ant track" wandering around the screen in straight lines or sometimed curves, selecting a narrow line, and at seemingly random intervals it will select an area of the image of whatever color it is on at the moment, then keep wandering.  This locks down Elements and it keeps doing that until I go to Task Manager and close the window (can't close it by clicking it closed on the X at upper right.

Reinstalled Elements, to the latest version, still having the same issue. 

Anybody had this issue, and figure out what to do about it?  I assume Elements is mad about something in my computer, as it happens with my old version and the newly installed one, but hopefully somebody knows what should be done to solve it.