Clear the cache, clear all matte settings from the .config and the problem continues. I had 2 days using TW I updated it from Leap 15.3
https://susepaste.org/96312361
Not sure you can upgrade from 15.3 to TW.
My TW with MATE works fine.
can you open a terminal as your user and type “mate-panel --replace”
you can try it in a console ctrl+alt+F2 (or f3 or f4 )
it didn’t work
the next thing to do is add a new user and login as that user and see if panel works.
useradd is the command and add a password to the user
sudo useradd -d /home/test_user test_user
sudo passwd test_user
the other choice is to reinstall tumbleweed fresh.
solution:
right button on the panel -> reset all panels