You have to make sure that the engine (internal, light works, etc.) that is used for preview in the:
menu, is the same that is used in the PhotoRendering Settings.
When I do the tiles with the ArchiTiles, it want I choose material of the tiles. And I choose the green material which is shown on the ball.
I have tried to use material which is called as BARVA-07 ... and it works right (in 3D window i can see the right colour and in Foto LightWorks is the colour correctly). But when I use myself made material it does not work (in 3D window I can see only a gray colour and I cannot see the shape of tiles. It looks like it is covered by something).