I have an external display, but the screen ratio is messed up in games.

I've got:
- A new MacBook Pro 15" with Lion (a month old maybe), it's the 2.2 GHz one (with 8 GB RAM)
- A Samsung Syncmaster BX2235 screen, working at a resolution of 1920x1080 pixels
- A VGA connector to plug the Syncmaster in to the laptop.
My problem:
When I normally use my laptop with my external display in Lion it supports 1920x1080 without a problem (see photo 1), when I watch a movie in full screen too, but as soon as I start up a game (any game: WoW, TF2, Worms, etc) in full screen and I set the resolution to 1920x1080 it'll mess up the screen (see photo 2). I'm not sure if you see it at first glimpse but there are black bars at both the left and the right side of the screen, the left one is bigger than the right one.
Anyway in WoW there is a function that you can run the game in Windowed but still Full Screen. When I do that I can access the top OSX bar (the one with the clock), and click on the display icon. It now shows there are 2 versions of 1920x1080 @ 60Hz (see photo 3). If I click the one that isn't checked, it'll fix the screen and I can view the game on this display exactly the way I want it.
I had an older MacBook Pro (from 2009, 15", 2.8GHz Dual Core) running Snow Leopard, I played some of the same games on that and I NEVER had problems with this screen. I gave it to my sis so I tested it again and there are still no problems.
Now naturally my question is: what is the problem and how can I fix it?
Photo 1: http://imageshack.us/photo/my-images/835/fotoik.jpg/
Photo 2: http://imageshack.us/photo/my-images/38/fotocopyt.jpg/
Photo 3: http://imageshack.us/photo/my-images/851/fotocopy2.jpg/

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