I have the same problem. I cannot access the server with the Plex app on my new ipad (iOS18.5). My other iOS clients (with older iOS), LG app, Windows app etc. still work fine. I cannot successfully update PMS on Qnap since version 1.40.2 (see post: Updates since 1.40.2.8395 do not work. Connection error. Clients cannot find server - #2 by todd_kingdon)… I tried it again this morning, same problem.
If the new Plex client insists on a new PMS version (1.141.5+), the setup will be unusable for me. What a shame!
