1.7.4 Problem with mobs spawning

I have just updated to Minecraft 1.7.4 and now all of a sudden there are barely any mobs spawning. I checked to make sure that I was in normal difficult and I saw 1 creeper but that is all. Also I tried different difficulties.
Another thing – mobs seem to to spawn normally in the nether and all other mobs except aggressive mobs spawn like they should. Please if you know how to fix this, please help!

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