Attempting to use the Physics List Helper to register e+e- annihilation processes causes a crash at run time.  They can be registered without problems if one avoids the physics list helper.  My code can be found below.

G4PhysicsListHelper* ph = G4PhysicsListHelper::GetPhysicsListHelper();
theParticleIterator->reset();
while( (*theParticleIterator)() )
{
  G4ParticleDefinition* particle = theParticleIterator->value();
  G4String particleName = particle->GetParticleName();
  if (particleName == "e+")
  {
    ph->RegisterProcess(new G4eeToHadrons, particle);
    ph->RegisterProcess(new G4AnnihiToMuPair, particle);
  }
}

And here is the error report.

G4ProcessManager::CheckOrderingParameters You cannot set ordering parameter [7] for AtRest DoIt  to the process ee2hadr

-------- EEEE ------- G4Exception-START -------- EEEE -------
*** G4Exception : ProcMan013
      issued by : G4ProcessManager::CheckOrderingParameters 
Invalid ordering parameters are set for  ee2hadr
*** Fatal Exception *** core dump ***
-------- EEEE -------- G4Exception-END --------- EEEE -------