After having disconnected my external monitor from my laptop, the lower panel is frozen, meaning I cannot click to open any programs and even the super key does not work to access my program menu. Everything above the panel, e.g. open terminal or firefox works.
I started having this issues since the upgrade to Plasma 5.21 (including an other issue, which was that my dual display configuration did not get saved properly anymore, previously no problems).
I have Kernel 5.11.1, KDE Plasma 5.21.1, wm: kwin_x11 dm: SDDM
Detailed hardware and system info can be found here:
http://ix.io/2R5G
Is this a bug I need to report to kde.org? which other log should I post here that could be helpful in this case?
Maybe this helps with that?
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@ricklinux that may solve that issue in brackets, I actually saw that post this week searching briefly in between work hours…
But to me it looks like this necessitates manually saving screen configurations which can easily be done via autorandr (no need to write a script) but I will try. Strangely my display configuration worked properly without this workaround (I see this post is from 2018…)
The only way I can scroll through my open programs right now is Alt+tab. I don’t even know how I can shutdown my system, except via cli that is luckily still open. 
Will see if we can troubleshoot, but this is why I generally don’t stay long on KDE, it’s beautiful looking but after a while my system always gets buggy. Maybe KDE and I are not made for each other after all. 
Are you are to hit super key and it brings up the menu and use tab?
Edit: I have been using KDE and really like it. Not too many issues. I also have REISUB set up to shut down if things go wacky as long as the keyboard is working.
superkey does not work weirdly…