If you have tried restarting the unit and re-configuring E-mail notifications to no avail then perhaps it would be best to contact WD Support about this. You can do so over the phone or via E-mail.
Call me stupid but I am just puzzled.
Tried to follow Trancer’s advice, was about to create a case via the link mentioned. I loaded up MyCloud config page in order to find the device’s serial number… for no apparent reason I decided to re-boot the device one more time (had done that many times over last few days)… and suddenly my mail box alert pop up a message, notifying me that an email arrived (“system restarted” notification from the device…)…
I did not change any setting… I went back to double check my mail box and absolutely sure I had not received any notification from the device over the last two weeks (ever since after the update).
This morning, I tried again unplug and re-plug the network cable, to simulate a network down, and the notification message arrived ok… so everything seems back on track… but I just don’t know why?