can't copy screenshot in KDE/Debian 10

I have Debian 10 with KDE. Everything was working fine and suddenly today when I tried to copy a screenshot it didn't work. When I press the printscreen key, I get the popup showing the screenshot with the "copy to clipboard" button like normal, but when I try to paste it into GIMP or another image program I get: "There is no image data in the clipboard to paste." I tried to "restart" the clipboard by: - right-click on the system tray - uncheck clipboard - click apply (clipboard goes away) - check clipboard - click apply This had no effect. I am able to copy & paste text using ctrl-c/ctrl-v, but the text doesn't show up in the clipboard in the system tray (The images don't show up here either). Is there some other way I can force the clipboard to restart or some way to fix this? **update** I discovered that in konsole if I highlight text and middle-click, it does NOT copy the highlighted text. So the clipboard is really messed up, but I can't figure out any way to reset it.