Hello,
I seem to have a similar issue. Live TV was working fine but now shows the below screenshot.

Plex Server Version 1.32.6.7557
Using Hauppauge WinTV-dualHD USB tuner, channels work without issues on WinTV Windows application.
I’ve tried rolling back to the 2 previous versions I found following the steps in this post here but the problem still remains.
I’ve attached logs and hope they’re the correct logs needed.
Thanks in advance for the help.