I really cant offer anything new, but if this were to happen to me I would try the following:

Select the objects you think are effected by the render.  Change their colors to a basic color, like red, blue or some high contrasting color so you can spot them easily when you do render.

Try rendering again and see if it was a texture/material issue

If this doesn't give you a clue as to what is going on, then I would select ALL objects, give them a basic color and try rendering again.

If this doesn't lead to a clue, try turning off some of the layers of objects you have and keep experimenting with some renders.  

None of this might work, but at least you can begin to narrow down the problem and know whtat the problem is not while waiting for e=on to fix the problem.

Hope it helps