After today's update to plasma5-workspace|5.10.1, plasmashell did not start
after reboot. .xsession-errors-:0 says:
ksmserver: Starting autostart service 
"/etc/xdg/autostart/tracker-store.desktop"
ksmserver: Autostart 2 done
ksmserver: IO error opening ICE Connection!
ksmserver: autostart service ("/usr/bin/ibus-autostart") finished with exit
code  0
ksmserver: autostart service ("/usr/bin/start-pulseaudio-x11") finished with
exit code  0
ksmserver: autostart service ("/usr/bin/plasmashell") finished with exit code 
13
New PolkitAgentListener  0x55c691f5c4e0
Adding new listener  PolkitQt1::Agent::Listener(0x55c691f6d4c0) for 
0x55c691f5c4e0
Listener online
...

It seems that plasmashell crashed? But I cannot see any traces or anything...

I updated from 5.9.5 apparently:
# grep plasma5-workspace\| /var/log/zypp/history
2017-05-11
09:10:26|install|plasma5-workspace|5.9.5-1.1|x86_64||repo-oss|4b711388d63cd7f66b4d96bca74b4543c0d5745d|
2017-06-14
08:25:10|install|plasma5-workspace|5.10.1-1.1|x86_64||repo-oss|9e29787a5c0e0492a9bb72450d54d9ce01e71404|