Hi Kaj! Thanks for your reply.
I already had an issue like this, and I already told you guys what is the procedure to reproduce this behaviour. Since I had no answer to the other thread, I thought it would be useful to send a simpler case to analyze.
Basically I see this is happening when you PREmap a surface. PREmapping is useful when you want the possibility to give THE GROUP a texture and see it correctly mapped on the inner faces.
To reproduce the case:
1. make a circle and extrude it to a cylinder say H100, delete the upper and lower faces;
2. measure the circle lenght and prepare 2 textures in photoshop which have to be "lenght"x100. Prepare two different textures to clearly see the difference when you apply the two materials;
3. Apply one of the textures to the circular face; it should match completely the face. With the face selected open the entity info panel, and change the front face material to default; now you have PREmapped the outer side of the circular face;
4. Triple click on the object and make group/component.
5. Now, if you apply materials to this group you will get a correct mapping of the outer face, as long as the dimensions of the texture of the apply material match the "length"x"H" dimensions of the face.
This group/component is extremely useful when using Dynamic Components so we use this a lot in our firm. Hope it's all clear!