There have been a number of complaints about a strange blue or purple line or haze on the side of the screen on the new Kindle Fire HDX. Read the reviews on Amazon, or check out this discussion for examples:
http://www.amazon.com/forum/kindle?_...x2K3RHQ2GI4XEM
The demo unit I saw at Best Buy had this problem as well.
Does your HDX have this issue? Is it distracting?
It's odd that Amazon is replacing some units but not others, and claiming that this blue haze was intentional.