My problem is recent and does not occur on other forums that are not associated with All About Circuits.
The problem does occur with the sister forum (I can't remember which one) to All About Circuits.

Would you be able to start a private conversation with me with more details about exactly which threads you were expecting emails for? I can see in our mail log that we are sending, and they are delivering properly. More information (privately) would help us debug this.

Rob

 

Thank-you for quickly fixing the e-mail problem.
Now I am correctly receiving e-mail notices of replies on the thread that did not before and from all the other threads.