I am doing the wed tutorial, and while doing the first room I have added the archway2 prefab, and added lights as per the tutorial, but the vertical faces of the prefab remain pitch black. The horizontal faces light perfectly.

Is this a bug, or am i doing something wrong ?

Also the button for choosing a colour on the light properties dialoge is missing.

I am using the Trial edition of A7.

Thank you in advance for any help.