"unable to create io-slave, Cannot talk to klauncher" when saving as root in Kate

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#1

Just installed 42.3 and setting up rsync server. Editing rsyncd.config in Kate, as root, can’t save the modified file. Get many repeats of this:

QStandardPaths: wrong ownership on runtime directory /run/user/1000, 1000 instead of 0                                                                                       
QStandardPaths: wrong ownership on runtime directory /run/user/1000, 1000 instead of 0                                                                                       
klauncher not running... launching kdeinit                                                                                                                                   
QStandardPaths: wrong ownership on runtime directory /run/user/1000, 1000 instead of 0                                                                                       
QStandardPaths: wrong ownership on runtime directory /run/user/1000, 1000 instead of 0                                                                                       
No DBUS session-bus found. Check if you have started the DBUS server.                                                                                                        
kdeinit5: Communication error with launcher. Exiting!
klauncher not running... launching kdeinit
QStandardPaths: wrong ownership on runtime directory /run/user/1000, 1000 instead of 0
QStandardPaths: wrong ownership on runtime directory /run/user/1000, 1000 instead of 0
No DBUS session-bus found. Check if you have started the DBUS server.
kdeinit5: Communication error with launcher. Exiting!
klauncher not running... launching kdeinit

User 1000 is my user identity. Permissions on /run/user is root-root. I thought root would be able to operate regardless of directory ownership. dbus service is disabled and active. Hints and pointer welcome.
The upgrade from 42.2 via DVD seemed to go well.

#2

Then ran rsync via grsync client. It appears that the new files on the client machine were not transferred to the server (via NFS) because the client couldn’t create a file or directory at the server:

   rsync: recv_generator: mkdir "/home/DataonK/autoBU/currentLinshiba/Patent/Patent3" failed: Permission denied (13)
]*** Skipping any contents from this failed directory ***
rsync: recv_generator: mkdir "/home/DataonK/autoBU/currentLinshiba/Patent/SBA-NSF" failed: Permission denied (13)
*** Skipping any contents from this failed directory ***

I used the --update option. All the directories involved, on client and server, have permissions for my ID and users group. I seem to be missing something–permissions, naming–but what?