Upon my return I have found that all of my subscriptions have been changed from "Site only" notification to "immediate". Ummm, what happened? Changing all of my subscriptions back to site only is a huge PITA.
Subscription notification change
We don't know what happened to change your settings, but the remedy is pretty easy:
This only takes one click.
Thanks - I had found that screen to update my preferences, but it's definitely more than 1 click. You can only show 100 items at a time, select them all and change the notification. I have 1570 subscriptions. So I've only done the first 500 or so assuming that most of the older threads shouldn't get touched.