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I saw the similar problem on Ubuntu 12.04 with django development server with mediageneartor. As Dustin suggested, I don't think this is related to the "del _Thread__block" statement.
I hacked the __getattribute__ of DummyThread class
 def __getattribute__(self, name):
 if name == '_Thread__block':
 import traceback
 traceback.print_stack()
 raise AttributeError
 return Thread.__getattribute__(self, name)
And I got the following stacktrace:
 File "/tmp/ve/local/lib/python2.7/site-packages/mediagenerator/filters/coffeescript.py", line 54, in _compile
 shell=shell, universal_newlines=True)
 File "/usr/lib/python2.7/subprocess.py", line 679, in __init__
 errread, errwrite)
 File "/usr/lib/python2.7/subprocess.py", line 1143, in _execute_child
 self.pid = os.fork()
 File "/usr/lib/python2.7/threading.py", line 907, in _after_fork
 thread._Thread__stop()
 File "/usr/lib/python2.7/threading.py", line 608, in __stop
 self.__block.acquire()
 File "/usr/lib/python2.7/threading.py", line 827, in __getattribute__
 traceback.print_stack()