A blank gray popup window has been randomly appearing, locking up my mac mini.  What is it?

Several times over the last few days a blank gray pop up window comes up on my mac mini.  I'm unable to click out of it or do anything but manually shut down by pressing the off button on the back of the box.  What is happening?  BTW, there is no text.

See if the following helps:
Gray screen appears during startup

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