Hey,
I ran into the same problem but it seems that I’ve managed to solve it.
Although we used 3ds Max instead of Blender, but the problem is basically derived from wrong unwrapping. You have to unwrap the object(s) in question manually (we used an Unwrap UVW modifier) instead of Automatic Flatten UVs and reimport it into Editor.
I don’t know if there’s any function like this in Blender but maybe there is. Anyway, I just wanted to share this little trick with all the users who might run into the same problem.
Regards: