I am currently facing a severe problem.
For years I had a Google account (not GMail!) which was/is registered to my e-mail address at a third-party provider. In order to use the Android market, I was forced to associate my Google account with a GMail address.
I can now use either my old e-mail address from the third-party provider or the new one from GMail to log into Google websites.
My Stack Overflow account was associated with the third-party e-mail address I used to use for login at Google. When I perform the login at Google now, it automatically switches to my new GMail address. The effect of this is that I can't access my own Stack Overflow account any more.
Do you have any suggestions about how I can solve this problem?