I just rebooted, and as usual a message flashed up and vanished a few
seconds after login; so I tried Xorg.0.log.
The new log, and the .old one, has a continuing sequence of
Auth name: MIT-MAGIC-COOKIE-1 ID: 141
[ 1619.936] AUDIT: Wed Jun 22 19:11:50 2016: 1662: client 37 disconnected
[ 1622.416] AUDIT: Wed Jun 22 19:11:53 2016: 1662: client 37 connected
from local host ( uid=1000 gid=1000 pid=4642 )
which looks like
https://access.redhat.com/solutions/230703
with a solution unverified in 2015 Jan and apparently not generally
available.
Any info?
John P