some multithreading within mitkPython freezes ... yielding an output like:

Process PoolWorker-1:
Traceback (most recent call last):

File "[...]/lib/python2.7/multiprocessing/process.py", line 249, in _bootstrap
  sys.stdin.close()

AttributeError: 'PythonQtStdInRedirect' object has no attribute 'close'
Process PoolWorker-2:
Traceback (most recent call last):

File "[...]/lib/python2.7/multiprocessing/process.py", line 249, in _bootstrap
  sys.stdin.close()

AttributeError: 'PythonQtStdInRedirect' object has no attribute 'close'

this does not always occur - my best guess is that it is caused by multiple threads in turn starting threads ... outside MITK this works, though