Really i didn't get the hint to solv it, you've made a lot of testing, could you please write it here shortly?
Edit your profile to change the email address to which you are having the notifications sent.
In other words, you need another email address to work with.
After you make the change, send yourself a PM, just to test it.
Get a notification for it?
Edit your profile again, to change the email address therein back to whatever you started with, if you so desire.
Send yourself a PM. Get the notification?
Wait for somebody to post in a new thread you are watching. Get the notification now?
Changing, then changing back, worked for me.
By the way, you are sure you - WillyW - are now receiving mail to every thread you responded or are subscribed to?
Not sure about the threads to which I subscribed before I fixed it by changing.
Since then though, it seems to work fine.
Hey... I got an email notification of your post in this thread.