The arguments to instantiate the remote webbrowser are inverted

From http://selenium-python.readthedocs.org/en/latest/api.html#module-selenium.webdriver.remote.webdriver

selenium.webdriver.remote.webdriver.WebDriver(command_executor='http://127.0.0.1:4444/wd/hub', desired_capabilities=None, browser_profile=None, proxy=None, keep_alive=False)

In src/sst/browser.py we are instantiating it as:

return self.webdriver_class(self.capabilities, self.remote_url)