Checkerboard pattern in iTunes videos While watching iTunes-purchased video content (TV/movies), I periodically see a quick flash of the gray/white DRM checkerboard that iTunes shows when you're trying to watch video while screen-sharing.

The gist:


Mac mini Mid-2012 (10.8.3) with locally-stored iTunes library
Screen sharing is enabled, but not active when this occurs
Sometimes it's a flicker about one frame in duration
Sometimes mid-video the checkerboard appears and stays.

When this occurs, scrubbing the video back some fixes it.

It never seems to happen in the same location in a video twice.


I would, of course, appreciate any advice or suggestions on how to keep this from happening. It's really quite jarring.
I have the same behavior. If you turn off the Screen Sharing service in System Preferences > Sharing, it will cure the issue. Turning it back on will again present the intermittent flashes of CPHD checkerboard during playback. Must be a bug - gonna call AppleCare and get them to file a bug report.