In the past week I've had 3 comments on Can I Mog It? 2 top level and 1 reply to one of my replies.
I got notifications and emails for the 2 top level comments, but no notification or email for the reply to my comment.
On January 1st I have an email from a response to TorelTwiddler, but just two days later on January 3rd I do not have an email from a response to me.
From October 21st, 2016 I do not have an email from a response to me.
It looks like Notifications related to replies to MY comments aren't working. I know you've said Curse.com isn't getting updates really right now, but this is pretty frustrating.
Can confirm that I'm seeing the same behaviour.
Sorry about that - I'll poke someone to see if the notification system is functional.