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My hostile mobs have stopped spawning. I've tried killing myself and restarting the game neither fixed it. I've probably got more than a weeks worth of hours logged on this world with no problems like this. I updated to 1.7.4 played for about a hour and then all the sudden mobs stopped spawning. I am NOT on peaceful I have set to peaceful and set back to normal multiple times with no improvement I also tried setting it to hard. I still have other mobs i.e. cows, wolves, zombie pigmen, just no hostile mobs. There is ample spots for them to spawn like my mob trap that previously worked PERFECTLY and now doesn't put out even one mob. While attempting different things I changed my render distance I did this while in the nether and when I did a Ghast spawned right in front of my face which I killed and then nothing else after that. While looking online someone mentioned setting my render distance to 10 so I tried it and it worked. I did it by my mob trap and it kept continuously working. So I tried to set my render distance back down and I was back at the same problem. This would solve my problem but my laptop can't handle such a high render distance so I'm still stuck in the same problem. Does anybody know how to fix this?

Same thing happened on our server. I'll have to adjust the render distance to 10 to see if it makes it any better.

Changing render distance to 10 did nothing. We reverted back to 1.7.2 and the mobs are spawning normally again.