Threading KeyError in Python 3.3 beta 2?

[Blind Anagram]

I thought I would try out Python 3.3 beta 2.  

This works well so far but I keep getting the message:

Exception KeyError: KeyError(6308,) in <module 'threading' 
    from 'c:\\Program Files\\Python33\\lib\\threading.py'> ignored

after some of my python code completes.  

Is this an issue worth reporting?