Perfect!
That worked with the 64 bits version, thanks a lot @Emmanuel.

Hi Emmanuel,

I am using the Exe: "C:\Program Files (x86)\Sweet Home 3D\SweetHome3D.exe"
I am on W10 and used the latest version for windows - Free version I found here: http://sourceforge.net/projects/sweethome3d/files/SweetHome3D/SweetHome3D-7.0.2/SweetHome3D-7.0.2-windows.exe/download

And I get ...

Thanks @Daniels118.
What is the option you have here by default that works with SH3D?
_JAVA_OPTIONS : -Xmx14000m

I am on Windows 10 Pro 64 Bits with 16GB RAM and now the latest versions of Java and SweetHome3D.

It was working fine, but I had problems with another programme, which prompted me to:
- Update Java
- Change my Advanced System Property and increase memory allocation
_JAVA_OPTIONS : -Xmx14000m ...