On mac OSX :
> run examples/basic/B1
> then /run/beamOn 1
crashed :
Crashed Thread:  0  Dispatch queue: com.apple.main-thread

Exception Type:  EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000

Application Specific Information:
terminate called throwing an exception
abort() called

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   libsystem_kernel.dylib        	0x00007fff8c2f3212 __pthread_kill + 10
1   libsystem_c.dylib             	0x00007fff8bf68af4 pthread_kill + 90
2   libsystem_c.dylib             	0x00007fff8bfacdce abort + 143
3   libc++abi.dylib               	0x00007fff94f08a17 abort_message + 257
4   libc++abi.dylib               	0x00007fff94f063c6 default_terminate() + 28
5   libobjc.A.dylib               	0x00007fff8ddab887 _objc_terminate() + 111
6   libc++abi.dylib               	0x00007fff94f063f5 safe_handler_caller(void (*)()) + 8
7   libc++abi.dylib               	0x00007fff94f06450 std::terminate() + 16
8   libc++abi.dylib               	0x00007fff94f07647 __cxa_rethrow + 85
9   QtCore                        	0x0000000105cb1031 QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) + 801
10  QtCore                        	0x0000000105cb353c QCoreApplication::exec() + 188
11  libG4interfaces.dylib         	0x0000000102b14b37 G4UIQt::SessionStart() + 295
12  exampleB1                     	0x000000010269d7b3 main + 1459
13  libdyld.dylib                 	0x00007fff8fefb7e1 start + 1

Thread 1:: Dispatch queue: com.apple.libdispatch-manager
0   libsystem_kernel.dylib        	0x00007fff8c2f3d16 kevent + 10


Environnement is here :
pc-76143:B1 garnier$ printenv | grep G4
G4LEVELGAMMADATA=/Users/garnier/Work/geant4/data/PhotonEvaporation2.2
G4NEUTRONXSDATA=/Users/garnier/Work/geant4/data/G4NEUTRONXS1.1
G4LEDATA=/Users/garnier/Work/geant4/data/G4EMLOW6.23
G4NEUTRONXS=/Users/garnier/Work/geant4/data/G4NEUTRONXS1.1