I checked the “sign in with Google” option in the Users service (after not using it during the first couple days of using the Users service). I got the following error upon trying to run the app:
ImportError: No module named google
edit: This was fixed by adding the Google service (as suggested here, for Facebook). But then I guess this is a bug report–I assume the Google service is supposed to be added automatically upon clicking that checkbox in the Users Service dialogue?