Pinching issue with skin

[achizzy]

I am currently working on a game character and have run across an issue with skin and my wrist rollbone set up. I followed an old Autodesk tutorial DVD for 3ds max to set up the rollbones for a game character, but this never happens to their model once it's skinned. The rollbones are set up correctly, so I don't know if this is just some kind of weird glitch. The ones I set up for the shoulders work like a champ. The wrist rotates well the one direction, but the other it messes up. Here are pictures of what is currently happening.

Right before it's breaking point:

After only a tiny bit more rotation:

Has anyone had this issue before? I'm using biped with added rollbones using max bones. I'm also using 3ds max 2011 sp3.

Thanks for your help.

- Adam