Transparent texture problem

[gruzawix]

So, i made sketchup object with transparent material(fence), put it in xpack, load in BTB, and setup material transparenct to alpha or chrome in BTB and all looks fine. but when im try track in game(RBR), that object part where needs to be transparent is black.

 

[Kytt]

Maybe something wrong with alpha channel in texture, i dont know