A small white square appears on my desktop

Once it arrives, I can't get rid of it, unless I restart. It's fixed - can't move it or change it. Can't figure out what I do to make it appear. I'm using Parallels along with basic Mac applications. I took a screenshot.

Just as a follow-up, I rebooted and carefully watched to see when it would happen again. It appeared after I switched to an alternate user and then back to the original user. The small white square appears on the orginal user screen, but not on the alternate user screen.
FWIW

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