@hansmex, @Vinci68,
The "light bars" observed with the YafaRay rendering engine are due to the light panels created when the [font=courier new]Add ceiling lights[/font] option is checked, so this is normal.
For information, the dlls used are those of the YafarayRendering-1.4.5 plug-in.

I just noticed the bug with SunFlow because these same light panels are no longer taken into account since compatibility with SH3D-7.0.
If this is not easily correctable and given that the option is not optimal according to the shape of the ceilings, the default behavior of SweetHome3D can be restored.


@bdfd,
This error message replaces the red cross of a default rendering. It appears when the memory allocated to SH3D is not sufficient to render an object which may have a certain complexity.