@sa2000 said:
Thanks for all the info. At the moment the theory is that there must be a
noexecon the mount which is something that the script used cannot overturn.
You were right, it was the noexec which was causing troubles. I fixed that and Plex Media Server seems to work again.
I still wonder though, does the latest PMS version set the bit and <=1.4.4 it did not?