Quote - You could try reloading the scene in Studio, and see if that image file gets recreated. If it does (same filename), then see if resuming the render will fix it. Once it is going, then close DS and don't restart the PC until the render is done.

That recreated the files and lux finds them when it starts, but he still has a white face.  

I used the the refine brush to add importance on his face and going to let it go a while to see if it just needs to re-render that area. If there's no change in the next 30 minutes I'll restart the whole thing.