OK - I took the links out of your post to avoid confusion.
Do make sure that you have the correct notification turned on. There is 'instamt' notification, daily notification and a weekly digest if I remember correctly.
Also, remember that one or more words within the title or body of the e-mail notification may trigger a spam filter, while other notifications may not have any 'offending words' and pass right through.
I haven't experienced any problems, as I explained, and no other complaints have come in so at this point I'm *assuming* it's something on your end.