Geant4 tracks stuck
In the Geant4 from LXPLUS I see several times that tracks are stuck. Initially this led to a hang, because checking for overlaps with parameterized volumes does not work for some reason. This feature is disabled as a workaround in 5ca08df0, but the tracks are still stuck and then the event is aborted. Could be a bug in Geant4 or something we do not handle properly.