I can't close anything or switch to anything using mouse or keyboard.

Gkrellm and htop shows that system is in idle and usual state. I can move mouse cursor and it changes its look when hovering over app border and move away.

It happened after I switched to tty using Ctrl-Alt-F2. Screensaver had been activated after some time. Then I had pressed Ctrl-Alt-F1 so as to return to Plasma.

Is it please possible to get Plasma to correct state ? I need at least properly close running apps.