Occasionally I do not get alerted for aircraft that are on my alert list. Just watched UAE9911 land at KTOL via Radarbox, and it is on my alert list. It never triggered, and I tracked it all the way to the ground. Checked my alert list again, everything looks OK. Flight ID box is checked, that flight number is on my list. Seems to work fine for registration alerts.
I was not getting flights from the network (my choice at the time), does that have anything to do with it?