<r>I had same problem when running sweethome3d on Ubuntu and fixed it:
<CODE><s>[code]</s>$ dpkg -L sweethome3d<e>[/code]</e></CODE>
Which gave me file /usr/share/sweethome3d/sweethome3d.sh which is used to start sweethome3d. I read that file and removed following line:
<CODE><s>[code]</s> -Dcom ...