Status (http://status.livejournal.org) says that the notifications are being cached to be sent later.
I got some DW comments that I don't have notifications for either.
Hang tight, be chill, and all that good stuff. I am perhaps hopelessly behind on my LJ friends page, though I'm trying to at least read the Support-related stuff. Please let me know if anything earth-shattering happened and you're not on my DW reading list (because that's smaller and I did get caught up on that).
(The Support-related stuff I'm reading is my Support filter, so if you see occasional entries marked "# = spr0t" then I've probably caught up on most of your recent exploits.)