Hi Hans,

thank you for your quick response.

Hmm, my software is new, my hardware is indeed older....I run SH3D 4.5 on a Debian Linux 8.0 system. The graphics hardware is Intel based, which is typically well supported on Linux systems

00:02.0 VGA compatible controller: Intel Corporation 82G35 Express Integrated Graphics Controller (rev 03) (prog-if 00 [VGA controller])

I.e. I would expect may slow behavior, but not wrong rendering. The artefacts are perfectly reproducible, they are also static, i.e. when an artefact is visible and I stop moving the artefact stays. The artefacts slowly become bigger and smaller when I change the angle of view in the room.

Can sweethome3d generate logs, which might be helpful in understanding what is going on?

Kind regards
Rainer