I had same problem when running sweethome3d on Ubuntu and fixed it:
$ dpkg -L sweethome3d
Which gave me file /usr/share/sweethome3d/sweethome3d.sh which is used to start sweethome3d. I read that file and removed following line:
-Dcom.eteks.sweethome3d.j3d.checkOffScreenSupport=false \
It fixed ...