I recently updated the sign player on all my Windows 7 boxes running the AverMedia H873 USB capture cards. They were running version 4.34.35 with air version 3.6.0.6090 according to StudioPro.
I have a scheduled task which updates them to the latest version of Adobe Air which is currently 22.x and they are confirmed to have that in Programs and Features.
AverMedia 1.7.9 stopped working after version 5.0.99 of the Sign Player was installed and the air version 20.0.0.223 using StudioPro to upgrade them.
I first thought it was a Windows Update because that seemed to be another coinciding event, but after rollback of System Restore, it did not fix them.
What DID fix them was installing an archived copy of CloudSignageStudioSetup.exe version 4.32.37 overtop of the current version (no uninstall needed) which also changed the reported air version to 3.6.0.6090 as well.
I don't know if it's the air version that's the issue or the sign player version.
There is still an issue of the AverMedia not loading the TV image on first execution after reboot, but I have script that kills the player and avermedia, then reloads them which was not working with version 5.0.99.
If 5.0.99 is installed, then I have to manually log into the player, press back on AverMedia, then double-click TV to get it working.