No such issues with mine so far, just the dreaded white specks inside the display. I'm gonna have to open it up and clean it out, plus maybe figure out how they're getting in there so I don't have to keep taking it apart. It's definitely dust from outside the case - Arizona is a dusty place and it gets into everything out here.
-AZ
As I mentioned in another thread I have one speck of what appears to be a very white dust particle in the middle of my display but I cannot see it unless I am certain lighting conditions so it is not a problem.
However, since the display appears to be well sealed on my 436 it must have come from the factory or off of something in the scanner that flakes off when jarred, perhaps in shipping.
I have noticed that the plastic cover for the display appears to be curved, perhaps to slightly magnify the characters of the display. I wonder if this may magnify any dust too?
If you are into computers you know that "work-arounds" for some hardware and especially software problems is a "way of life" so I an use to it and actually have fun finding these "work-around".