Comment # 4 on bug 1222583 from Schneider

Hello everyone,
maybe it will help if version 1.28.1 of mate-panel is rolled out. I have the
same problem.

See here at Github:

https://github.com/mate-desktop/mate-panel/issues/1433

We couldn’t solve the problem for Tumbleweed yet, but in the thread it is also
said that the problem was fixed with the version of mate-panel 1.28.1.
Currently version 1.28.0 is in the package sources.

Greetings
snydar