I'm having a very annoying problem ATM when compiling for source engine. Where my character's wrists seem pinched. I am assuming they are rotating a full 360 degrees. Though I am not fully experienced in 3ds Max to determine if the bones are aligned to one another down their hierarchy.
Note: I am using a standard de-compiled valvebiped skeleton for this character.
Is there a simple way to correct this problem? Any help much appreciated!

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My best guess (never having worked with standard valve biped you mentioned), is that the bone was skinned at the wrong orientation. The easiest solution is to remove skin weight from all twist bones if they exist. The real solution is to turn off Always Deform in the Advanced Parameters rollout of the skin modifier, fix the twist bone orientation, and then turn it back on.