Talk:NPC/@comment-4960683-20120326175251/@comment-4674838-20120326180731

NPCs will not spawn if Goblin Army is present, or if your house is on an area affected by Corruption." - this page.

^Possible issue? Also, you need to have the coins/bombs/etc. in your inventory I believe, not stored in a chest. And you need to wait a few in game days. Also, NPC's cannot spawn at nighttime, they can only spawn during the day.

Not sure if cracked Terraria is an issue or not.