Shadow buff problem with SSS

I have SSS and basic material on same geometry. Both with no alpha (eg. cant see thru) both have same shadow settings (set to cast and receive) … but the SSS seems to let spot buffer light go past it, atleast partially. How is this possible? (sss is Material node material)

Light in question is ofcourse Spotlight, with shadowbuffer shadowing.
Using 2.54b

Nevermind i think i fixed it.

Solution was Z-transparrent On at some material, which propably belonged to the SSS material node, though i am not sure how.