I am signed in to multiple google apps accounts. When I go to gmail.com it starts out with the default acct, as expected. If I switch to acct B or C (via drop down menu on top right of the screen), the switch works as expected: I see email for acct B or C.
But when I try to switch to acct D I get a sign in screen, with account D LISTED as one of the signed in accts in the blurred area.
I can successfully use other google products, such as search, with acct D on the top right of the screen.
I can also use an incognito session and successfully sign in to email at acct D, whether or not it is the default acct.
Is this just a hiccup in the system or am I missing something?