blending does not always work properly for some meshes

I've attached an example showing this behavior.
It's not always happening ... it seams like 50%.

Also 2 screenshots are attached to the .tar.bz2

It seams that the sorting of the elements or the blending it self is not working as it should.
But only for some .3ds files. Other .3ds files never show this effect.

You can easily change between the broken and another .3ds file in my example