Empty window after starting the Sierra

After the upgrade to Sierra tonight, a new problem has started to appear.  Every time I have start or restart my computer, an empty window (titled 'Window') is displayed.  It cannot be reduced to a minimum, but can be expanded or closed.  Any thoughts on what could be the cause?

Click on high black Apple left and choose "force quit." Whatever this window, it must be listed in the window, force quit.

Highlight just the app, choose force quit and that should fix this problem.

Tags: Mac OS & System Software

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