I have a 23" Cinema Display. Lately I've been noticing "ghosting," or whatever the equivalent of burn-in from CRT is. It started about a month ago when I noticed I could faintly see my desktop icons when viewing dark colors. Now, even when I am on a webpage for a while then go to another webpage with dark colors, I can see the outlines from the previous page. Anyone else having these problems? My display is about a year and a half old.