YouTube users are experiencing issues with an advertisement for the "AR Drawing" app by Hypernova Limited, which fails to load and forces viewers to exit and restart their videos. Complaints have surged, particularly on Reddit, with users reporting the ad reappearing frequently and buffering indefinitely. This problem primarily affects Android users and is not indicative of a broader issue with YouTube's ad system. Users have tried clearing their cache and restarting devices without success, and YouTube has not yet acknowledged the problem. The app is still in development and promotes early access for feedback.