I then was invited to (and did) set up a NEW gmail account which I am
now using. B ut it caused incredible grief as I have rental
properties and have many ads and existing clients who are expecting to
reach me at my FORMER gmail address.
I can't help but think that signing up with google checkout had
something to do with the sudden invalidation of my password and
username because it was the only "new" thing I did and less than 24
hours later I have no valid password or username and my backup email
is apparently un-recognized by google.
Gmail is NOT userfriendly and I can find no help anywhere and nobody
to emaill to ask why my account was invalidated. I can tell you one
thing: DO NOT EVER SIGN UP FOR GOOGLE CHECKOUT!
I have a feeling that you may just have been phished.
VM
But I agree, I've never had a problem and I have a Google Checkout
account associated with my primary GMail login. It's very possible
this person was misdirected and got phished.