[Glorious1]

Code:

I just completely wiped my Kodi machine and reloaded from scratch (trying to solve a remote problem, but that's another issue).

I set up the Kodi sources pointing to the server over NFS, just like before, but Kodi says it can't find anything:
"Unable to Connect.  Couldn't retrieve directory information.  This could be due to the network not being connected."

HOWEVER, the server logs show a successful mount from the Kodi machine at that time!

html:
Nov 12 15:19:30 Tabernacle 1 2022-11-12T15:19:30.896849-08:00 Tabernacle.local mountd 1424 - - export request succeeded from 192.168.0.101

Nov 12 15:19:30 Tabernacle 1 2022-11-12T15:19:30.954661-08:00 Tabernacle.local mountd 1424 - - mount request succeeded from 192.168.0.101 for /mnt/Ark/Media

Nov 12 15:19:30 Tabernacle 1 2022-11-12T15:19:30.956518-08:00 Tabernacle.local mountd 1424 - - export request succeeded from 192.168.0.101

What's going on?

Kodi machine is Mac mini 2012 running macOS 10.15.7 Catalina and Kodi 19
Server is TrueNAS - nothing changed on it while starting over with Kodi.

DEBUG LOG:  https://paste.kodi.tv/ojadajudux   The error occurs at 16:20:06.  There is indeed a folder on the server /mnt/Ark/Media/Movies/

[Glorious1]

I fixed it by adding mapall=root to the NFS share on the server, although I didn't need that before. 

Strangely, accessing the shared folders directly from the client OS (Go > Connect to Server > nfs://192.168.0.102/mnt/Ark/Media/Movies/)
worked from another client computer, but not from the Kodi machine.  Maybe I had changed my user ID before to be the same as on the server, I don't know.