I don't think this style of mention, which uses the UTAG function, has ever generated a notification via PM/e-mail or whatever. It used to be possible to use the MENTION function to generate a notification, but that seems to have been disabled recently - whether it was part of this update or some other one, I'm not sure.

Both of these functions could be generated by using the @ symbol and then someone's username, but if you selected the person's name when it popped, it would be a UTAG, whereas if you just typed @[username] and kept going, it would create a MENTION when you posted it.

I can see why one of these duplicative functions was killed off, although I would have preferred it to be MENTION that survived since I liked getting PM/e-mail when I was mentioned.