Paint Shop Pro :: Commands Involving Control Key Will Very Rarely Work

I use PaintShop Pro v. 11.20 at work. I was using it as normal one day, and it crashed. This is nothing new, the crash is because I tend to have a lot of programs open at the same time and I had not rebooted my computer soon enough to clear the RAM. The problem occurred when I reopened the paint shop after rebooting, and all commands involving the control key (copy/paste, etc.) as well as the delete key do nothing. Very occasionally, it will allow one of these commands to work, but this is now very rare. If I have an object selected, the highlighting will blink briefly as it does when you try to copy it, but otherwise does nothing. I can still use these commands from the drop-down menus. I think this is probably just some random bug that happened when it crashed for whatever reason. If I can avoid reinstalling that would be preferable, as I would have to have the disks mailed to me by the head office. I looked to see if there was some setting that would put things back to normal but could find nothing. I reset defaults, no change.