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Nikon likes to deny this, but it is a common problem. The seals around the rear glass are crap on some cameras. Also, the sealer has been known to gas out and smear on the inside of the glass.
Nikon is also very inconsistent in what they do about it. Sometimes, people get it repaired for free out of warranty and I was denied in warranty.My camera was denied warranty repair less than one year from production. I would love to kick someone at Nikon LA, California repair center.
Do a google search and you will find hundreds of threads on camera forums everywhere recounting this problem.