Hi, the bug seems to be caused by that flightgear and simgear are built against different versions of libopenscenegraphs: flightgear: libopenscenegraph56 simgear: libopenscenegraph65 Reebuilding the flightgear package with the new libopenscenegraph65 (libopenscenegraph-dev 2.8.3-4), fgfs works again. Regards, Pavel