Hmmmm :(

Just to do some basic problem determination, could you try just a default scene with default V4, with the V4 basic materials, no hair or clothing and...

1. go to Materials room
2. select the Chest materials group
3. on the right, hit the "Apply Ambient Occlusion" wacro button
4. pose the character with something touching the chest eg. her hand or some small primitive prop with default materials, or really any damn thing
5. set one or more lights to make some shadow across the figure where the crack between chest and (whatever) doesn't have bright light shining straight into it
6. render at same settings above 

I'd just like to see if you can get it to do anything at all.

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