Plex Server Latest (1.13.6.5339-115f087d6-x86_64) not accessible but running!

I’ve just “downgraded” to 1.13.4.5251 as per the comment I found in this thread:

But I still have the same issue…
I got a request from DSM to upgrade to “1.13.4.5271” but after I did (via the Package Manager) I still have the same problem

and the service seems to be starting fine:

ash-4.3# ./start-stop-status stop
Stopping Plex ...
ash-4.3# ./start-stop-status start
Starting Plex ...
/var/packages/Plex Media Server/target/Plex Media Server: /lib/libstdc++.so.6: no version information available (required by /var/packages/Plex Media Server/target/libgnsdk_dsp.so.3.07.7)
/var/packages/Plex Media Server/target/Plex Media Server: /lib/libstdc++.so.6: no version information available (required by /var/packages/Plex Media Server/target/libgnsdk_dsp.so.3.07.7)
/var/packages/Plex Media Server/target/Plex Media Server: /lib/libstdc++.so.6: no version information available (required by /var/packages/Plex Media Server/target/libgnsdk_fp.so.3.07.7)
/var/packages/Plex Media Server/target/Plex Media Server: /lib/libstdc++.so.6: no version information available (required by /var/packages/Plex Media Server/target/libgnsdk_fp.so.3.07.7)
ash-4.3#

And equally strange, the log files are not updated:

-rwx------+ 1 plex users 2.1K Sep  6 12:23 Plex Tuner Service.log
-rwx------+ 1 plex users 2.5M Sep  6 12:23 Plex Media Server.log

(12:23 is when I updated to 1.13.5.5332-21ab172de and later to 1.13.6.5339-115f087d6 this morning).

Thanks!