Here's an example: I just failed to login to Zonino myself.

I enter in the Gmail address that I use for registrations and other junk. I get the message: "Accounts don't match. You are currently signed into Google as [my normal Gmail address]. ... Force Google logout?" Forget that. I'm not interested in logging out of Gmail. Logging out of #1, into #2, out of #2 and back into #1 is more work that simple registration. I expect that I'm not the only person with this problem. I hope a solution can be found, because it would be really helpful.