Composite Shapes cause bus error in gdml export

ROOT
4

Just a quick additional note. It seems that not only the “.gdml” export:
gGeoManager->Export(“MyGeom.gdml”)
needs all volumes to have non-null media.
Also the “.C” export:
gGeoManager->Export(“MyGeom.C”);
exhibits the same problem.
Exporting to a “.root” and/or “.xml” file does not seem to be affected.
Is this described somewhere?

BTW. A GDML expert’s advice is still needed here: [url]Loading mixtures of mixtures from GDML in TGeoManager 8-[