usage: update-gravatar [-h] [-e EMAIL] Set your account picture to your Gravatar.optional arguments: -h, --help show this help message and exit -e EMAIL, --email EMAIL Email account for which to fetch the avatar.
If you haven't, I suggest closing your browser, restarting it, and reloading your profile.
It'll instead gracefully fall back to the cached copy!
By default, if you are using Rails, it'll use the Rails cache.
I do not believe logging in and out would influence this at all, since your gravatar is shown to everyone, not just you.
Your logging in and out (of Stack Overflow) should have no affect.