I have the same "problem": in previous versions, I only had to set global notifications, all my jobs sent mail to the global email address.
With version 9.5, if I edit any of my jobs, I found that "send email" is checked, the field below is empty, and the radio button is on "use global...".
But as mkaec mentioned, you have now to specify an email address which, in my memory, was not the case in 9.0 and previous.
So it seems now that you cannot set any global email address through "use global notification" with 9.5, you have to set it on EACH job (and so, I have to modify all my jobs since).
Am I right?