I had a similar problem and tracked it back to Special Edition 9 window which did not like the way I set some parameters. Try eliminating windows on a copy, and see if it goes away. If that it is it, then you can track down the offending one. (Could be a door too)
I was busy throwing alligators out of the pond when I ran into it and did not have time to figure out precisely what was going on with the window parameters, worked around it with another window that was close enough at the time.
HTH
Ted Taylor
Atlanta, GA , USA
iMac (Retina 5K, 27", Late 2015)
3.3 GHz Intel Core i5 32GB
AMD Radeon R9 M395 2GB
OS10.14.2,
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