This is what I get in Terminal. I hope this helps. If not, let me know what I need to provide.

Thanks

sweethome3d
[warning] /usr/bin/sweethome3d: Unable to locate /usr/lib/jvm/java-6-sun/jre/lib/javaws.jar in /usr/share/java
Exception in thread "main" java.lang.ExceptionInInitializerError
    at com.eteks.sweethome3d.j3d.Component3DManager$RenderingErrorListenerManager.setRenderingErrorObserver(Unknown Source)
    at com.eteks.sweethome3d.j3d.Component3DManager.setRenderingErrorObserver(Unknown Source)
    at com.eteks.sweethome3d.SweetHome3D.addComponent3DRenderingErrorObserver(Unknown Source)
    at com.eteks.sweethome3d.SweetHome3D.init(Unknown Source)
    at com.eteks.sweethome3d.SweetHome3D.main(Unknown Source)
Caused by: java.awt.HeadlessException
    at javax.media.j3d.VirtualUniverse.<clinit>(VirtualUniverse.java:294)
    ... 5 more