So as of the past couple of weeks I have been getting a playback error on YouTube, as per the quote/link below. It seems as though the issue may be around how advertisements are sent to the client now from YouTube. Has the AdGuard team looked into this possible issue?
https://support.google.com/youtube/thread/10329866?hl=enFor those getting playback errors starting about February 25th I believe the issue is due to a change in how ads are displayed and adblock programs are blocking them. This is an issue on both chrome and firefox, I'm using UBlockOrigin and it only happens when I'm signed in. This is likely something the creator of the extension will have to look into.