Hostile Mobs not spawning

[Guest]

A while ago they had an update where things were supposed to get harder (more spawns, stronger spawns) the longer you stayed in an area. Maybe there's some bad data from that saved to your player file which for some reason causes you to not cause mobs to spawn. I recall Sig having his files reset once, so that could be connected to why he specifically seems to have troubles.

I'm grasping at straws here.