BAM. Thank you, Chuck. That’s all I needed!
Guess what I found? 
Check the UID in use. Verify the UID is a member of the group which owns /dev/dri.
You can also work with the PLEX_GID of the group instead. (my preference)
Something in my system changed. I felt like a NOOB when I found it.
The moment I did –
Back to full strength
(running around like a cat in a room full of rocking chairs today
)
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