No longer getting email when someone replies to subscribed thread
It has taken me a while to realize it, but for several weeks I have not been getting email notifications when someone replies to a thread I have posted in. I checked user cp and I have instant email selected, but when I go to my list of subscribed threads, none of them are checked. I have tried several times to check the threads to see if that will start the emails again, but every time I go back to look, they are un-checked again.
I am using a Mac with OS 10.5.8, and the browser is Firefox. I updated yesterday to the most recent version, but still don't get email notifications. I also tried just once to check the threads in the Safari browser (also updated yesterday). That didn't work either.
Any idea what might be going on here?