root crashes when trying to start opengl viewer

Hello,

  Whenever I try to start the opengl viewer to display a ROOT generated geometry I get the error below (in 6.12/04, it worked fine in all 6.10 versions).

Thanks for any suggestions and help.

Best,

 Wolfgang

 

 

Info in <TCanvas::MakeDefCanvas>:  created default TCanvas with name c1

 

 *** Break *** segmentation violation

[/usr/lib/system/libsystem_platform.dylib] _sigtramp (no debug info)

[<unknown binary>] (no debug info)

[/usr/local/cern/root6/lib/libRGL.so] TGLSAViewer::CreateFrames() (no debug info)

[/usr/local/cern/root6/lib/libRGL.so] TGLSAViewer::TGLSAViewer(TVirtualPad*, TGLFormat*) (no debug info)

[<unknown binary>] (no debug info)

[/usr/local/cern/root6/lib/libCling.so] TClingCallFunc::exec(void*, void*) (no debug info)

[/usr/local/cern/root6/lib/libCling.so] TClingCallFunc::exec_with_valref_return(void*, cling::Value*) (no debug info)

[/usr/local/cern/root6/lib/libCling.so] long TClingCallFunc::ExecT<long>(void*) (no debug info)

[/usr/local/cern/root6/lib/libCore.so] TMethodCall::Execute(void*, long&) (no debug info)

[/usr/local/cern/root6/lib/libCore.so] long TPluginHandler::ExecPluginImpl<TVirtualPad*>(TVirtualPad* const&) (no debug info)

[/usr/local/cern/root6/lib/libCore.so] TVirtualViewer3D::Viewer3D(TVirtualPad*, char const*) (no debug info)

[/usr/local/cern/root6/lib/libGpad.so] TPad::GetViewer3D(char const*) (no debug info)

[/usr/local/cern/root6/lib/libGeomPainter.so] TGeoPainter::DrawVolume(TGeoVolume*, char const*) (no debug info)

[/Users/korsch/GoogleDriveUK/EDM/geant/Pulstar/Pulstar2017/gdml/./PulstarSetup] Pulstar(TGeoManager*) (no debug info)

[/Users/korsch/GoogleDriveUK/EDM/geant/Pulstar/Pulstar2017/gdml/./PulstarSetup] main (no debug info)

[/usr/lib/system/libdyld.dylib] start (no debug info)