In example/novice/N06 it is sometimes useful to turn G4Scintillation off. Now, G4Scintillation is a G4VRestDiscreteProcess and has an AtRestDoIt. Problem is, when G4Scintillation is not active and the track is an electron (a stable particle as opposed to an anti-particle or unstable particle) the method InvokeAtRestDoItProcs in G4SteppingManager2.cc throws a G4Exception because, in this case: NofInactiveProc==MAXofAtRestLoops
This was intended to protect giving unnecessary results when no AtRestDoIt processes exist. In the next release, it will be changed to issue just the warning. The change will be commited on CVS, soon.