Plex is updating their Guide data source. It appears that 1.16.0.1226 only handles the old Guide and 1.16.1.1291 only works with a newly created instance of the tuner with the new guide. Ideally you would know this and delete the tuner from the Server Setting Live TV +_ DVR, then upgrade to 1291, and then redefine your tuner on 1291. There appears to be a short window after reboot when 1291 shows the old tuner in Settings and you can delete it, then recreate it. If you wait a few minutes, then 1291 can’t find a tuner and it can’t create a new new tuner and it spins. In Windows, reboot, watch for Plex Server to appear in the taskbar, click it, go to setting, and delete the tuner as fast as you can type/mouse. For slower people, Uninstall Plex Media Server, which leaves all the files still on disk, then in File Explorer go to your C:\Users(your username) directory, show hidden folders so you see AppData, navigate to AppData\Local\Plex Media Server\Updates. find the 1.16.0.1226-xxxx folder, run the 1.16.0.1226-xxxx.exe in the packages subdirectory. Now you are back on the previous release (and Live TV works), and you can do what we should have done in the first place and delete the Live TV Tuner from Settings, then upgrade to 1291, and then redefine your tuner and get the new Guild data.
In the Live TV Guild grid, you have old data if at the end it says “Powered by Gracenote” and you have new data if it says “Powered by Plex”.
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