Run hangs on OS-X

[ArtPoon]

The processes are still up but there is no CPU load. Inspecting the main process gives the following:

Call graph:
    2874 Thread_13629769   DispatchQueue_1: com.apple.main-thread  (serial)
    + 2874 start  (in libdyld.dylib) + 1  [0x7fff913785fd]
    +   2874 Py_Main  (in Python) + 2995  [0x10e9da363]
    +     2874 PyRun_SimpleFileExFlags  (in Python) + 718  [0x10e9c9821]
    +       2874 PyRun_FileExFlags  (in Python) + 137  [0x10e9c9cd3]
    +         2874 ???  (in Python)  load address 0x10e92b000 + 0x9ec2c  [0x10e9c9c2c]
    +           2874 PyEval_EvalCode  (in Python) + 54  [0x10e9aaa24]
    +             2874 PyEval_EvalCodeEx  (in Python) + 1641  [0x10e9ab093]
    +               2874 PyEval_EvalFrameEx  (in Python) + 13079  [0x10e9ae4d4]
    +                 2874 ???  (in Python)  load address 0x10e92b000 + 0x868c8  [0x10e9b18c8]
    +                   2874 PyEval_EvalCodeEx  (in Python) + 1641  [0x10e9ab093]
    +                     2874 PyEval_EvalFrameEx  (in Python) + 13079  [0x10e9ae4d4]
    +                       2874 ???  (in Python)  load address 0x10e92b000 + 0x86864  [0x10e9b1864]
    +                         2874 PyEval_EvalFrameEx  (in Python) + 8080  [0x10e9ad14d]
    +                           2874 ???  (in Python)  load address 0x10e92b000 + 0x7d6bc  [0x10e9a86bc]
    +                             2874 PyEval_CallObjectWithKeywords  (in Python) + 93  [0x10e9b101f]
    +                               2874 PyObject_Call  (in Python) + 101  [0x10e934f72]
    +                                 2874 ???  (in Python)  load address 0x10e92b000 + 0x149a7  [0x10e93f9a7]
    +                                   2874 PyObject_Call  (in Python) + 101  [0x10e934f72]
    +                                     2874 ???  (in Python)  load address 0x10e92b000 + 0x27796  [0x10e952796]
    +                                       2874 PyEval_EvalCodeEx  (in Python) + 1641  [0x10e9ab093]
    +                                         2874 PyEval_EvalFrameEx  (in Python) + 13079  [0x10e9ae4d4]
    +                                           2874 ???  (in Python)  load address 0x10e92b000 + 0x868c8  [0x10e9b18c8]
    +                                             2874 PyEval_EvalCodeEx  (in Python) + 1641  [0x10e9ab093]
    +                                               2874 PyEval_EvalFrameEx  (in Python) + 8080  [0x10e9ad14d]
    +                                                 2874 ???  (in Python)  load address 0x10e92b000 + 0xb0b46  [0x10e9dbb46]
    +                                                   2874 PyThread_acquire_lock  (in Python) + 104  [0x10e9d85cc]
    +                                                     2874 _pthread_cond_wait  (in libsystem_pthread.dylib) + 727  [0x7fff96c6ec3b]
    +                                                       2874 __psynch_cvwait  (in libsystem_kernel.dylib) + 10