Here is a nice one ! :-) By adding the character "_" in any line inside a input macro .in fed as batch macro to an application, will cause the application to crash with a G4Exception. For example, try to add the following (comment!) line in exampleN02.in: # Adding this character: _ makes Geant4 CRASH !!! Then, run exampleN02 as usual: exampleN02 exampleN02.in You will get this: unexpected character after line continuation character *** G4Exception: Aborting execution ***
The problem is fixed.