Hi guys! So I'm in creative mode, and I'm trying to use the NPC spawner flags to populate my town. I've read the wiki multiple times, and I honestly can't tell if I'm doing anything wrong. I input everything correctly, and it stays in the flag when I click off it. But nothing is spawning. I even left it running while I ate to see if it was a timing issue, but nothing happened. I've tried with multiple different entities, too. Is there an activation button I'm missing?
(FYI I'm playing 1.7.10 with the newest lotr update)