Problem with transparancy and textures dissapearing

[OzBoz]

I'm trying to model a syringe but I run into a problem. As you see the whole syringe is transparant plastic. On the inner side of the tube there is a texture with a label. Which is mirrored on V (so it looked good from the outside).

And it worked before but when I render it now it disappears on places where it should appear on the front. The whole inner has the label material and the outer side of the faces the basic plastic material. Because it has thickness the outer side is plastic as well (on both and back from the faces).

I don't understand what's causing this. Double-Sided, Trace Reflections and Reflect on Backside are on for all plastics. And it used to be ok, so I'm clueless. Anyone got some things I can check?

[vraychu]

did you reverse faces?