Further internet searches reveal that this could be a WIndows-10 issue.  Many users report the double-click misinterpretation in general with that OS.  We are attempting some of the suggested solutions that are easier to implement (change mouse double-click speed and plugging mouse directly into the computer, instead of a USB hub or docking station).
Trouble with impoly (open) misinterpreting mouse click
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Our users need to find the area under a curve.  We use impoly (open), and they trace the curve on an image.  However they are having an intermittant and unpredictable problem where part way through their tracing, Matlab ends the trace -- as if it has read a double-click, instead of a single-click.  The users have already tried tracing slower and being careful to only click once per point, but the problem still occasionally occurs.  
I have been unable to locate a similar problem, let along solution, during internet searches.  
Any help you can offer would be greatly appreciated.
Answers (3)
  Shashwat Bajpai
    
 on 7 Aug 2019
        I was unable to reproduce the problem on my end on Windows-10. Please try re-installing MATLAB and contact technical support if the problem still persists.
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  Shashwat Bajpai
    
 on 8 Aug 2019
        I would suggest using the drawpolygon function if the problem is still persisting. Even MATLAB suggests using drawpolygon instead of impoly.
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