Image persistence, in LCD monitors, is when you leave an image up for a while, and the can see a “ghost” of it after it’s gone.
The best brief explanation of it is here:
“LCD Image Persistence- Can Burn-In Happen to LCD Monitors?
By Mark Kyrnin, About.com”
Here’s some explanation of how to fix it- from www.syeager.org
And this, too, about fixing stuck pixels, too. PaulSpoerry.com
This refers to JScreenfix. Free. Fun.
Thanks to Adam Abel, from Lacie, for the help and links!