crashing to the point can't use LibreCAD

Hi
I am a new user running version 2.1.3 on windows 10.

Wanted to use LibreCAD to help redesign our laundry and powder room. Program seemed to be working fine until I copied a duplicate of the room layouts on the same workpage. Now when I try to open or use that file the program stops working and crashes to desk top. Any help?

Thanks