I expected mobs to spawn (like usual) when I was looking for slimes. I couldn't find any after looking underground for like half an hour, even know I knew where the slime chunks were. But I also noticed that zombies, skeletons and spiders didn't seem to spawn either. Neither did they in the nether. Difficulty is hard (3), and gamerule doMobSpawn is true.
=== Map Details ===
Generator Option: Custom Terrain
Gamemode: 0
Difficulty: 3
Seed: 3714387998929305102
I have custom generator settings as well, though I highly doubt this will affect it.
EDIT:
Mobs do sometimes spawn, but not as common as they usually do. Maybe the passive mob entity count affects it? I have a cow farm with like 50~80 cows in it.
EDIT 2:
Didn't seem to be it, but found something strange: The world seemed to forge peacefull mode, even though the world was locked in hard mode. I couldn't summon in any zombie, skeleton, or any mob that would normally've spawned in Easy mode or higher
EDIT 3: Just found out that mobs can't be spawned in when summoned in spectator mode, but still something strange: Mob spawn rates are extremely low, both in the Overworld and Nether.
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Please force a crash by pressing F3 + C for 10 seconds while in-game and attach the crash report ([minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/finding-minecraft-data-folder]) here.
im running 14w18b an have no issues with various mob spawnings, also tested in SP creating various worlds of all types an again had no issues with mob spawning.
Check your server.properties file .. you may have it to peaceful in there and even though changing it in game to easy, normal etc it wont have any bearing .. although unlikely worth checking that out.
Also what Game version was your map Generated in and what seed is the map?
I can confirm this in a superflat of mine
difficulty 3
gamemode 1
gamerule doMobSpawning true
time set 18000
setting: 2;7,49x1,4x3,2;1;
No hostiles at all
@@unknown: Are you in spectator mode ? Mobs despawn immideately, see MC-46776
Cannot confirm. Created a superflat world and mobs did spawn. Do you have it on peaceful?