I've got an O-edit problem , I see black , If I try to make a face.

Screen:

try to re-install.if not good;try this:
hmm. hold "ctrl" and then drag with mouse up and down(like zooming) while zooming,the model should become brighter or darker.(in perpective view).

hope it helps

ok. it's fixed.

I can make faces again.

Thanks for your help.