Yes im sure: http://imgur.com/jPfVrwb
unfortunately this problem is still bothering me. Maybe i did something wrong, but what? I tried like everything, changing wrinkle scale, change min max range of the flex(it helps only with a_b corrective shapes, but not with a_b_c and more)

Well, i was trying different sheet, the broken normal appear only when corrective shapes like A_B + A_B_C + B_C is active. Is there any way to NOT export corrective normals at all?

So i was trying to make some hwm models. When corrective shape is active, then random dark areas appear on that flex.
Just for test i take Revzin's Elizabeth model source files and compile her with last verison of BST 2.7.1 and Blender 2.77a
http://imgur.com/Bdrr7Ve

old version of BST 2.0 is kinda solve this problem with corrective shapes, but here is appear another problem, ALL flexes become more darker than usual when they are active even without corrective shapes.