Python Selenium WebDriver drag-and-drop

I cannot get drag-and drop working with the Python WebDriver bindings. I am working with Google Chrome and Firefox on Mac OS X. There is a thread here where someone had a similar problem.

I have tried using ActionsChains:

from selenium import webdriver
from selenium.webdriver import ActionChains
driver = webdriver.Chrome()
actionChains = ActionChains(driver)

actionChains.drag_and_drop(source, target).perform()

Have you managed to get the Python WebDriver drag-and-drop working?