I have the same issue as well. I had my Mogul swapped for a refurb today. My old one had the white spot, but it wasnt that bad. The refurbed one I got today has a huge one. It is very noticable, and it's noticable on dark screens as well.
I have to harass Sprint about my refurb, it has dirt inmbedded into the edges around the battery. I'm
ed with it.