User-Agent:       Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101
Firefox/58.0
Build Identifier: 

Tumbleweed with all updates.
Situation: After
  Energieverwaltung/Sitzung > Benutzer wechseln
but the following new login is using the same login name.
The login seems to be successful, but then:
it's impossible to log out, change user, start a new program or shut down /
reboot is only possible using a command shell (if one is open!)



Reproducible: Always

Steps to Reproduce:
1. select Energieverwaltung/Sitzung > Benutzer wechseln
2. login to same user than before
3. use the Kontrollleiste to try to start a user / logout / reboot  
Actual Results:  
strictly reproducible.
When the login is using another user name, all is working correctly

Expected Results:  
login to original job