I was just binge watching Netflix from my MacBook Pro on a TV streamed using HDMI. It automatically started the final episode of the season but about 20 seconds into it, a screenshot from a local video file on my computer appeared on my screen for about 3 seconds, after which the Netflix show continued. The screenshot was from a personal video on my local machine that I haven't opened in a month and wasn't opened at the time.
Not sure how to explain what happened. Tried rewinding the Netflix video but did not see the screenshot again. Has my machine been compromised in some way?