Not entirely sure whats causing this problem on my system. I think it either has something to do with the night vision, or some way the shadows have been modified by the UI. It also looks like its some sort of window on top of everything that's making my screen a bit darker than normal.
Here's a screenshot...
http://i18.photobucket.com/albums/b1...EQ2_000002.jpg
As you can see there's some sort of black overlay covering most of my screen except the bottom portion, and there's an after image of my character (The cloak being the most visible) just above my actual character.