Hi,
I think I have very few current subscribed threads but a total of 832 appear in the "Subscribed threads in folder" field/box.
I don't believe I have accidentally touched the "opt out" link, maybe but I don't think so. I wasn't active/logged in here much in the last three weeks for work reasons, maybe that affected something.
Maybe it was just a glitch or something, as in the last ~15 hours I have received the last two email notifications for subscribed threads (the one about Fuse LED reset function and this thread) as normal.