To everyone not receiving notifications currently:
The problem with notifications has been fixed. The nature of the problem/fix is such that 1) everyone's notifications function was fixed at the same time and 2) the fix is permanent, can't be broken again*.
So, anyone who is not receiving notifications should look at his/her profile Notifications page to make sure the proper boxes are ticked.
*at least in the same way as before and I don't foresee another break in Notifications...SMF made a change in the way it was receiving notifications from the server. We amended our forum to conform and so...problem fixed permanently.