What your seeing in the LG content store is a Loader only and the app is regularly updated. To view your current version go to server setting/ Authorised Devices.
To solve your issue, first try turning the TV off at the power source for two minutes or more, remote off will not work.
If that fails uninstall the app, power off at power source, delete the app from authorised devices, restart Plex, re install the app on TV, Link your app. You will need to customize your LG client to your liking again.
Make sure you add the Server’s LAN IP address and port (32400) to the LG client settings, along with selecting all the Audio Types, video settings, general settings.
