Comment # 6 on bug 1210031 from jolz j

obviously "xfwm4" is missing. 

Hot fix for the session: 

Try to start it (Alt+F2 then type "xfwm4" or open whisker menu, type "xfwm4"
then press Return to "Run xfwm4".


Fix: 

- check in "session settings", then xfwm4 should be immediate restarted:
https://docs.xfce.org/xfce/xfce4-session/preferences#session
This will try to restart xfwm4 on crashes 5 times (should be enabled by
default, saved in xfce4-session.xml. this should be ok)

- if windowmanager crashes, try to enable / disable Compositing (see
https://docs.xfce.org/xfce/xfwm4/wmtweaks#compositor )


So why is xfwm4 missing? crash? not started?

relevant logfiles are: 
- ~/.xsession* or ~/.local/share/sddm/xorg-session.log (depending on your
display manager)
- syslog (sudo journalctl -b)