PHP 5.6

Upgraded from v1.39h to v1.57c, now no order confirmation or account creation emails
I can successfully send emails via Admin->Customers->Email
But with a new account creation, no email is sent.
Orders go thru, but again no order confirmation email

The Admin --> Configuration --> "E-mail Options" was unchanged
E-Mail Transport Method: PHP

How can it work manually sending, but not work otherwise?