The exact same thing happened to me after an aborted render. It stopped mid render so I quit the application and went back in. When I opened the file up it was in wireframe and when I went to texture shaded it was black and then I noticed all the lights were gone. I binned it and started again with a VERY black mood!!!!! thefixer, poser coord.

Injustice will be avenged.
Cofiwch Dryweryn.