Browser: Chrome, FireFox... — broken everywhere.
With the introduction by Google of Google+, he's dead, the ability to hold 2 different sessions of Gmail (just Gmail and Gmail is tied to corporate email).
Keep 2 different browsers for this inconvenient.
UPD 1. — incognito window = two browsers)
UPD 2. Google + — account is not activated.
UPD 3. "Multiple login" is Enabled.
— as I understand it works for a services account with one domain.
I have one email on gmail — google domain, respectively, the input gmail.com
second: login with www.google.com/a/work_domain.ru/LoginAction2?service=mail
UPD 4. SOLUTION:
Enable "Multiple sign-in" in the account settings (just in case, have included in both)
According to the instructions: >> my mail @gmail.com the second mail @mydomain.com. I go in @gmail.com there choose to go to another ACC, log in @mydomain.com,