New
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That panel isn't an error but a warning, useful to prevent loss of data that still may be in use. I'd do an investigation into what DropWindow is, could be something you have installed or a customization that has that included, start with a Search of the Internet for the name.
Of course Google Search shows nothing. It doesn't happen with every shutdown, maybe one in ten times. I make sure everything is shut down, and even checked Task Manager to see if something running in the background. Nothing unusual.
But, LesFerch, below, may be on to something.
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I will do some experiments, but that could be it. I don't use Synergy often, but I will look for a correlation the next time I use it..
I know it's just a warning, but it was just bugging me that this would occasionally pop up on shutdown.
I don't either ......... but we have no choice in this Windows matter. Go take a look at the Event Viewer after you take a few Valium tablets first
Try to resolve some of those unexplained warnings and errors.
To MS credit, they do have to support a basically infinite combination of hardware and software.