Okay, Mr. Morgan, I know this thread is almost 2 years old, but, would you be able to elaborate as to what settings you changed in Malwarebytes to resolve this issue? I'm on 1903 and having the same...

Having a similar issue; I have Mail set up to show banners and play a sound. Confirmed in Notification settings. I set up my sound scheme to play AOL's old "You've got mail!" when I get a new...