Resolved! Random lines appeared during a meeting
During a talk I was giving yesterday, someone tried to logon after the talk had started. I could see their name pop up in very small print in the left hand side of the screen, then the name moved about a bit at random leaving a trail behind it. It stopped moving after a minute or so, but the trails were left as a blue line which persisted throughout every slide for the rest of the talk . I've attached a link to the section of the talk where this occured. Can anyone tell me what happened here and what I can do to avoid it in the future? I am dealing with a quite elderly audience here, so asking the culprit what they were doing isn''t likely to help. http://follies.org.uk/wp/wp-content/uploads/2022/11/bad-section.mp4
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