I have an AMD AM1 CPU system. With the Youtube 6.7.0 add-on the My subscription feed, that was working with 9.2.1, stops working with 9.2.2. With 9.2.2 My API key still works and I'm able to access my previously made playlists, liked videos and most other functions, but My Subscription feed no longer works, and it's really the only feature I use. I saved right before the update, so I rolled back to 9.2.1 and everything works.
I updated because although the system is stable, occasionally the video refresh rate will stick at 24 Hz even to main menu, and I'll have to manually reset or re-boot to get the refresh rate back to 60 Hz. I don't know if the update would address this issue, as it seems like it is for issues with the NUC.
Edit: System auto-updated to 9.2.2 and Youtube is fully functional.