Huh. That's weird. Their notifications really have always been hit-or-miss since the beginning. Some people get them, some don't. The online store's email system is particularly bad. I've set up many email requests over the years for out-of-stock items to let me know when they're available. The Aventine was the most recent example. I've never received one single email from that "service" and the only way I ever wound up getting things I was missing was just randomly checking the store several times a week. Eventually they would show up as being available and I would immediately jump on them when I got in there. Major pain in the ass any way you cut it. Their website just sucks in general.
P.S. Don't hold you breath on backfills (100 & 101). They never send them once they're back in stock if you're a subscriber. I was missing 8 issues at one point over the past year and I just bit the bullet and got them on my own individually, either through their store, or Amazon or eBay. I knew I would never see them otherwise. Subscribers always seem to take a backseat behind the online store with their dodgy inventory system.