Kentaarka

That indeed fixed the issue... thanks a lot Still, why did the mobs spawn when I ran MC without forge? And no, I didn't install a chicken gods mod... just VoxelMap, VillageInfo, ArmorStatus HUD and TreeCapitator... strange... Well, thanks for your help

I uploaded it here: https://www.hidrive.strato.com/lnk/ggDmuLIZ

Now I even removed the whole .minecraft folder and downloaded it again, installed 10.12.0.1027 afterwards, but mobs still don't spawn. Tried 10.12.0.1028 as well, but no spawning mobs there too.

I emptied the mods Folder, there is nothing else installed. I tried a new world, there mobs DO spawn, just like your picture shows. Still, in my current world no mobs spawn once forge is enabled. The fml-client-latest.log: http://pastebin.com/ALrvkDLi

At some point, I noticed there were no hostile mobs during the night. The same goes for deep mine shafts, no hostile mobs. Apart from monster spawners, those work. I began do deactivate the mods I got installed, but none of them fixed the issue, however, the mobs startet spawning again, when I ran vanilla MC without Forge. So it seems to be a forge issue. Running MC 1.7.2 with Forge 10.12.0.1027, however, I got the same issue with 10.12.0.1022 and 1023 too (didn't try the versions between '23 and '27, and I don't know about the versions before '22). Java 1.7.0_51-b13 64Bit on Windows 7 64Bit PS: I would have liked to attach the fml-client-latest.log, but I get an error "Cannot access attachments upload path!" when I try to