I ran in the same problem and I was able to fix it by patching the selenium python module.
This is the file, I've submitted a patch to the selenium github https://github.com/Lazik/selenium/blob/d790915a1124bd4730f10855c7e0a40ab6e6b59f/py/selenium/webdriver/common/service.py
Overwrite the service.py file you can find it in
your python_install folder\Lib\site-packages\selenium\webdriver\common
Mine is here:
C:\Python33\Lib\site-packages\selenium\webdriver\common