Skully,
You metioned "white flash" You think it is from the flash reflecting off the snow? I had some of those on my Moultrie cam also, but I also had a couple that had a little of the top of the pic normal then the next one showing a little more. I figured that maybe the snow had filled the shutter lens up and caused it to be all white, then as it fell off more of the pic was normal.
MRH