I don't know WHEN they went away, but I no longer get e-mail notification of threads that I am (supposedly) subscribed to.
I have checked the settings, instantaneous e-mail notification is still set.
Is this an effect of the upgrade/update ?
If so, no problem, I can wait until it is fixed for everyone else.
In the mean time, I just go to the list of threads I am subscribed to and check it manually.
Ahhh, just looking lower down on THIS page as I type - in "Additional Options" notification type is set to instant e-mail notification, so that is still the default setting for threads that I respond to ("contribute" to ?) whatever the term is.