Alrighty, ran into a problem here that I can't solve. I was experimenting a bit with the floor and reflections, etc and now I can't get it back to default. I managed to make the floor.. graspy? I can't find the word for it. It's a strange noise as floor and background, instead of a smooth, nice floor with the reflection of the cars it's a background full of white/black noise and I can't get it back to default no matter what I do.
Maybe someone here knows the problem (even though the explanation to my problem is somewhat bad), but if someone here knows what I need to do, please explain as detailed as possible.