I think I have also cured it before - but as I mentioned originally, can't remember how (it certainly wasn't anything heavy like editing the registry).
But whatever fix I previously did doesn't seem to have been a permanent solution, because it's reverted to not notifying.
It's dangerous, because I'm not aware that it's failed. If you don't get any notifications, you just assume there's nothing to be notified of, and not that the notifier has stalled.
It's only when they've been absent for a suspiciously long time (months, in this case), that I've become curious, and realised I have a backlog of updates - many of them important.
I have also found a lot of forum discussions about it, but no universally agreed fix.
It's interesting that many users are complaining this only started happening when Microsoft began aggressively pushing Windows 10. (See MHC's thread about underhand tactics).
The timing does seem a little suspicious, when it's something that's worked for literally years. Although I must admit, I can't immediately see how discontinuing the notifications would trick or encourage anyone into installing Windows 10.
Perhaps they hope that users who used to rely on the prompts will respond by setting everything to automatic (don't prompt me), giving Microsoft a free hand to install whatever they like?
Edited by TLM (Tue 28-Jun-16 14:10:12)