Server Version#: Version 1.16.5.1554
Player Version#: 1.2.0.875-b7362913 (August 27, 2019)
I know Ples doesn’t support beta OS releases, this is purely informative
Upon installing the latest developer beta of macOS Catalina (19A546d), the Plex desktop app locks on login screen and becomes unresponsive.
Web player still works great.
Plex devs are aware of this, thanks! 
Looks like the following build still doesn’t quite work on the latest Catalina build:
Plex - 1.3.0.910-77ef46d6: September 11, 2019
Catalina - 10.15 Beta (19A558d)
It’s unresponsive, but what’s odd is, if you resize the window after an action such as clicking or entering a passcode, it follows the action. So the app is “working” but it’s not exactly usable.
We’re close!
I notice that if you change the size of the window it moves to the next screen. If you just click it doesn’t do anything until you resize the screen.
This is Plex Player released on 14 September 2019 and on Catalina Beta 8.
Any news on this darcilicious?
I have a same problem!!! Solution??
Catalina is GM, so please make the app stable ! or should i say … working
Thank you !
Not really a bug per se. Plex uses the Qt framework, which leverages OpenGL and OpenCL APIs for drawing the GUI. Apple has decided to deprecate OpenGL and OpenCL in the upcoming Catalina update in favor of their “Metal” API for graphics processing. So until Qt 6 is released or Plex uses a different framework, this will likely remain a problem, as Qt 5.12 does not include any Metal integration what so ever.
That along with Qt 6 being slated for release sometime around the end of 2020, I wouldn’t hold my breath for a fix anytime soon.
I find that the new version of Plex (After 1.2.0) doesn’t work on the 10.15.1 Beta, but the old version of PMP 3.104.2 can still work on it
Not GM yet, just beta 8 right now.
Today Catalina beta release has resolved this issue.
I can confirm that the issue is resolved with the current beta. 
