SOLVED!:

I have just discovered the problem is caused by the fact I use a tiling window manager. Switching to icewm, for example, I get full 3D functionality.

@Puybaret:
The Sweethome3D script opens only the splash screen and stops (as before, with 5.6).

$ /opt/SweetHome3D-5.7/SweetHome3D
amdgpu_parse_asic_ids: Cannot parse ASIC IDs: Ressource temporairement non disponible
Exception in thread "main" java.lang.InternalError: XXX0 profile[1]: GL3bc ...

Installed 5.7 from the tgz 'SweetHome3D-5.7-linux-x64.tgz' and happily the program opens via 'SweetHome3D-Java3D-1_5_2', and runs 2D layout.

However there is no 3D rendering, and the following errors are logged on startup

$ /opt/SweetHome3D-5.7/SweetHome3D-Java3D-1_5_2
Java 3D: implicit ...

Further explanation of the problem using SH3D on Arch Linux.

Installation of the package available for the distro results in only the splash screen. Using the start script is difficult because the libraries listed are located in different directories. It may be possible to edit the script. I have ...

In the start script above, it probably depends on your shell, but may be necessary to replace (in line 4) the deprecated "readlink" with "realpath" to get the intended result.

I was thrilled to find this script, as I had the same problem on Arch Linux. I had to change "readlink" to "realpath" but SH3D then loaded. Very disappointed that it is not in fact doing any 3D. The bottom right panel remains blank and the plan shows a jumble of white rectangles where furniture and ...