This was my suspicion after viewing the images that were posted. I simply
find it very hard to believe that this camera with a metal composite body
would exhibit cracks of this nature. It should be an extremely durable
and long-lasting chassis. There is no way that even constant swiveling of
the LCD/lens housing would exert the sort of tangential or axial stress
that would cause that sort of thing.
So I figured that more likely the crack could be a hairline scratch in
either the finish on the camera or perhaps even a scratch due to carriage
or storage. It helps to know that others are seeing the crack in exactly
the same spot.
I wish that each individual finding the scratch could also post their
serial numbers on the cameras. This would help determine if the problem
was with a certain series range during manufacture.
I spoted the same line in my F505.I do not think it is a crack. Maybe
some mechanical error in painting.