Many sites (like YouTube) are currently in a technical arms race with adblockers. If you see a "Violation" message, you may need to completely remove your adblocker, clear your cache, and install a fresh copy of uBlock Origin with default settings.
How to Unblock Your AdBlocker in Chrome (Bypass "Please Disable" Warnings) how to unblock adblock in chrome
Switch to uBlock Origin (not "AdBlock"). It is lighter, more efficient, and has built-in lists to defeat most adblock detectors automatically without you doing anything. Many sites (like YouTube) are currently in a