- Did you open the world with the mod installed? (I think yes "EntityNPCHumanMale")
- What mod was it?
It seems, you have forge installed, when you opened the world and Minecraft crashed ("Is Modded: Definitely; Client brand changed to 'fml,forg"). And it crashed before loading the world graphically ("Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used")
Have you ever tried to open the world without any mod? (don't forget to make a backup copy of you world!)
1. Start Minecraft 2. Options -> Resource Packs -> Open resource pack folder 3. Go one folder up 4. You are in the minecraft folder! (on mac there is no ".minecraft"-folder, it's just "minecraft")
... maybe I misunderstood you... What does not work (in detail)?
"Vec3 Pool Size: ~~ERROR~~ NullPointerException: null[failed to get system properties (java.lang.NullPointerException)]" I think the OS X on windows makes some problems...
open Minecraft click on Texture packs, then open texture packs folder. go to the folder, containing the tP-folder and open the folder called "screenshots". there is the picture.