"DraftSight Has Stopped Working" Error Message

Every time I close DraftSight 2018 an error message dialog pops up that says:

"DraftSight has stopped working. A problem caused the program to stop working correctly. Please close the program."

The message never pops up while I'm using DraftSight; it only appears several seconds after I save my work & exit the program. My drawings are saved without any issues & I can open them again without any errors.

How can I fix this problem?

thanks,

Pete

DraftSight 2018 x64 SP2.1 running on Windows 10 64-bit Home Edition, fully up to date.