I had this same problem. This was on linux. After I removed and reinstalled all Java stuff on my computer it started to work. Maybe you can try the same.

To reply on my own post:

I removed and reinstalled all Java stuff on my computer and now I get the same behavior from the command line as from the webstart link if I use the ./SweetHome3D shell command.

However if I use the ./SweetHome3D-Java3D-1_5_2 command SH3D starts!

SO, I have no idea what ...

I'm beginning to think it is related to the graphics card. On my laptop, which is also running ubuntu 18.10, I can run the webstart SH3D if install the java3d and icedtea package. This has an intel graphics chipset.

On my desktop, I can't. It is a 12GB core i7 920, using an NVIDIA Geforce 660 Ti ...

Hi Pascal,

I tried your suggestion, but no success. I should have told you that the messages I got were from staring Sweethome3D from the command line.

So I typed both ./Sweethome3D and ./SweetHome3D-Java3D-1_5_2 in the directory where I extracted SweetHome3D-6.1.2-linux-x86.tgz.

Don't know if I should start a new thread, but I cannot run Sweethome3d in Ubuntu 18.10. Both of the scripts in the download directory fail to run.

With both scripts I get:

#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (os_linux_x86.cpp:291), pid=17622 ...