For each particle that is identified as looper Geant4 5.2 prints FOUR lines: G4PropagateInField: Warning: Looping particle. G4Transportation is killing track that is looping or stuck This track has 0.00108415 MeV energy. G4PropagateInField: Warning: Particle is looping - tracking in field will be stopped. Thanks to this I cannot see anymore at which event the job is. Can this warning be - reduced to one line or - be switched off and reduced to some statistics per event.
For your information, with Geant4 5.2, more tracks are abandoned as the threshold number of 'field-substeps' has been reduced from 10,000 to 1,000. This is a parameter of G4PropagatorInField that can be tuned by the user, using the following method: inline void SetMaxLoopCount( G4int new_max ); // A maximum for the number of steps that a (looping) particle can take. I have created a revised version of G4PropagatorInField.cc which makes this report optional (on condition of verboseLevel > 1). I am making it available for your tests (see "File" above) and further testing by Geant4 system testing for future release.
The tag for this change geomvol-V05-02-00 has been accepted by system testing.