So sorry about that. I did try to switch to Markdown at that time (Markdown was unresponsive, so I switched back), possibly visiting the settings form for the first time, and there’s NoScript running in my browser. But more likely just clicked there by mistake, even though I can’t imagine how that could happen.
Hmm. I’m not sure why this would have changed, but I note that in your account settings the “notifications for replies to comments” is unchecked.
So sorry about that. I did try to switch to Markdown at that time (Markdown was unresponsive, so I switched back), possibly visiting the settings form for the first time, and there’s NoScript running in my browser. But more likely just clicked there by mistake, even though I can’t imagine how that could happen.