another update: noticed that problem also on IrfanView and FlashFXP now too.
But also with Chrome, though a little different: it still got the minimize button, but it doesn't work.

somehow it became worse :(
today I noticed that all new started notepads can't be minimized anymore. before it happened only with longer running processes.

with switching to tablet mode I was...

I couldn't find anything about this issue at all. good that you had some more luck!

I did 2x sfc /scannow - found nothing

then I did Dism /Online /Cleanup-Image /RestoreHealth - that was...

Hello,

I got a very weird problem with my Win 10 Pro: I can't minimize some apps to taskbar, because the button is greyed out.

It happens only after some uptime (I keep my PC running 24/7). ...