IronPython throw InsufficientMemoryException when using numpy in threads

I have some IronPython code that being called from within a C# application.
This code worked fine until I decided to change one function to run in a thread.
when numpy functions called in a python thread a InsufficientMemoryException exception is thrown.
I Searched for solutions but didn't find. can someone explain why it is happening and how can I fix it?

I think this is happening only when I have two threads that use numpy

I run code like this:

C#:

_python.functionA(); # _python was created with "Python.CreateEngine()"
_python.functionA(); # twice on purpose

Python:
my_python_script.py

import threading
import time
import numpy

def blah():    
    print numpy.array([100,100,0])

def functionA():
    t = threading.Timer(0,blah)    
    t.start()
    time.sleep(2)

And I got this Exception:

Exception in thread Thread-1:
Traceback (most recent call last):
  File "c:\Program Files\IronPython 2.7.1\Lib\threading.py", line 552, in _Thread__bootstrap_inner
    self.run()
  File "c:\Program Files\IronPython 2.7.1\Lib\threading.py", line 756, in run
    self.function(*self.args, **self.kwargs)
  File "C:\workspace\my_python_script.py", line 113, in blah
    print numpy.array([100,100,0])
MemoryError: Exception of type 'System.InsufficientMemoryException' was thrown.

Thanks

UPDATE 13/07/14

I get this exception even when I run only one thread and via IronPython interpreter, without the C#:

C:\>"c:\Program Files\IronPython 2.7.1\ipy.exe"
IronPython 2.7.1 (2.7.0.40) on .NET 4.0.30319.18063
Type "help", "copyright", "credits" or "license" for more information.
>>> execfile(r"c:\workspace\my_python_script.py")
>>> functionA()
>>> Exception in thread Thread-1:
Traceback (most recent call last):
  File "c:\Program Files\IronPython 2.7.1\Lib\threading.py", line 552, in _Thread__bootstrap_inner
    self.run()
  File "c:\Program Files\IronPython 2.7.1\Lib\threading.py", line 756, in run
    self.function(*self.args, **self.kwargs)
  File "c:\workspace\my_python_script.py", line 6, in blah
    print numpy.array([100,100,0])
MemoryError: Exception of type 'System.InsufficientMemoryException' was thrown.