Chunk gen problem

[Cosmology27]

I'm using Monster 1.0.5, and I've added a few more mods, and taken tons out.
When I go into a new area where chunks need to be loaded, it will just crash. There's nothing in the area, it's a pretty new world without anything complex in it yet. Also, I'm able to create new worlds, which obviously creates new chunks, and there's no problem. I also have 10GB ram, with 4GB allotted to FTB.
Here's the crash report.
http://pastebin.com/fmK7ZGTX

Any ideas of what I might need to fix or take out?
Thanks for the help!

 

[Tristam Izumi]

Double permgen JVM flags? Perhaps the smaller permgen argument (which is second and thus the loaded flag) is causing issues for you? I'm not sure if/where global JVM arguments on Macs are stored, though.

 

[Cosmology27]

Sorry I don't know what you mean by that. I've heard those terms but don't know exactly what they mean.
Is it that I'm running two permgen JVM flags, and I can only ever run one? Sorry about my ignorance on this one.

 

[Cosmology27]

Also I should add that new worlds don't seem to have this problem at all.
I'm guessing it's a problem with the custom world I made, but I don't see what it could be. All the premade chunks work fine, it's just when it needs to generate new chunks.... you would think it would be the exact opposite of that...

 

[Tristam Izumi]

I was referring to this line:

JVM Flags: 4 total; -Xms256M -Xmx4096M -XX:PermSize=256m -XX:PermSize=128m

See how there are two -XX: PermSize flags? If two of the same kind of flags are present, only the last one read is used.

Usually when this happens, the system has globally assigned the JVM flag. I know how to find and fix this on Windows OSs, but not on Macs, though a quick Google search may help you.