OpenShot crashes on launch on OS X 10.8.5

[Simon]

OpenShot v2.1.0 64bit won't launch for me (the icon bounces then exits immediately). I'm running OS X 10.8.5. The OpenShot debugging python script crashes, too (its error message is included at the end of this report).

Running OpenShot's launch-mac.sh directly gives the following errors (after all the dyld load lines):

Traceback (most recent call last):
  File "/Applications/OpenShot Video Editor.app/Contents/MacOS/openshot.py", line 18, in swig_import_helper
    fp, pathname, description = imp.find_module('_openshot', [dirname(__file__)])
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/imp.py", line 296, in find_module
ImportError: No module named '_openshot'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/cx_Freeze-5.0-py3.5-macosx-10.6-intel.egg/cx_Freeze/initscripts/Console.py", line 21, in <module>
  File "openshot_qt/launch.py", line 53, in <module>
    from classes.app import OpenShotApp
  File "/Applications/OpenShot Video Editor.app/Contents/MacOS/classes/app.py", line 40, in <module>
    from classes import info, settings, project_data, updates, language, ui_util, logger_libopenshot
  File "/Applications/OpenShot Video Editor.app/Contents/MacOS/classes/logger_libopenshot.py", line 31, in <module>
    import openshot
  File "/Applications/OpenShot Video Editor.app/Contents/MacOS/openshot.py", line 28, in <module>
    _openshot = swig_import_helper()
  File "/Applications/OpenShot Video Editor.app/Contents/MacOS/openshot.py", line 20, in swig_import_helper
    import _openshot
ImportError: dlopen(/Applications/OpenShot Video Editor.app/Contents/MacOS/lib/python3.5/_openshot.so, 2): Symbol not found: ___sincos_stret
  Referenced from: /Applications/OpenShot Video Editor.app/Contents/MacOS/libopenshot-audio.3.dylib
  Expected in: /usr/lib/libSystem.B.dylib
 in /Applications/OpenShot Video Editor.app/Contents/MacOS/libopenshot-audio.3.dylib

Crash in debugging script:

Traceback (most recent call last):
  File "openshot-debug.py", line 40, in <module>
    process = subprocess.Popen(["lsb_release","-a"], stdout=subprocess.PIPE, stdin=subprocess.PIPE, stderr=subprocess.STDOUT)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 679, in __init__
    errread, errwrite)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 1228, in _execute_child
    raise child_exception
OSError: [Errno 2] No such file or directory