Just to check, if you look at your profile on here and go to 'edit my profile' is the gmail address the one that shows for you? whatever that email is you have to use on Gravatar.
how do i go into profile or should i ask Ab Editor. i clicked on my name but it just came up with when i joined, and my last entry on here, if that makes any sense.
I find the gravatar website fiddly, I have to go through something called worldpress too but it does work eventually so I like to changed mine regularly!