blank panel and no right-click menu

[David Lang]

This morning when I plugged my laptop into my office monitors, it didn't detect 
them and start using them (not unusual), I ran systemsettings5 to reconfigure 
the monitors and they showed up, except that the panel ended up on the wrong 
monitor, and no matter what option I picked, it wouldn't move to the correct 
one.

So I updated everything and rebooted, but after the reboot I can't get the panel 
to show anything, and I can't get the right-click menu on the background to come 
up.

I did a lot of googling, deleted ~/.cache, ~/.config/plasma* ~/.config/k*, 
rebooted many times with no success.

alt+f2 does bring up the ability to run apps/programs, and the system works well 
otherwise.

starting plasmashell manually gives me:

$ plasmashell
kscreen: launcherDataAvailable: "org.kde.KScreen.Backend.XRandR"
kscreen: Launcher finished with exit code 1 , status 0
kscreen: Service for requested backend already running
kscreen: Primary output changed from KScreen::Output(Id: 99 , Name: "eDP1" ) ( 
"eDP1" ) to KScreen::Output(Id: 99 , Name: "eDP1" ) ( "eDP1" )
unversioned plugin detected, may result in instability
unversioned plugin detected, may result in instability
unversioned plugin detected, may result in instability
unversioned plugin detected, may result in instability
unversioned plugin detected, may result in instability
unversioned plugin detected, may result in instability
unversioned plugin detected, may result in instability
unversioned plugin detected, may result in instability
unversioned plugin detected, may result in instability
Containment graphic object not valid
Containment graphic object not valid
Containment graphic object not valid
kscreen: Primary output changed from KScreen::Output(Id: 99 , Name: "eDP1" ) ( 
"eDP1" ) to KScreen::Output(Id: 99 , Name: "eDP1" ) ( "eDP1" )
Containment graphic object not valid

how can I fix this?

David Lang