3.6.10 Updated | Now cannot log in

I just updated to phpList 3.6.10 and when I try to login, I can see the login flash open then quickly back to the login page. When I repeat the login, the same thing keeps happening. What is going on?

Update 1: Now the error is “Hmmm… can’t reach this page”. refused to connect, check connection, check proxy and firewall, ERR_CONNECTION_REFUSED. I tried the Refresh button - circles right back to the same error.

Update 2: Now, I can log in, back to the same original problem of flash open the back to login page loop. Can anyone help?