I am using selenium package with Python (https://pypi.python.org/pypi/selenium) with Windows 7.
When I try to login to my facebook account I use the send_keys
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Looks like there are (were) some bugs in the Chrome webdriver: https://code.google.com/p/chromedriver/issues/detail?id=435
The core of the problem looks to be when either the keyboard is configured for a non-English language, or if the webdriver process and the chrome display are running in different language/environments (e.g., when going through a remote display from one host to another, etc.)