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I don't know about the games you listed, but I know a lot of games (such as conterstrike) always launch to the menu screen in 640 x 480 or 800 x 600, then when you actually start a game, that's when it changes the resolution to the one you've setup (1024 x 768 etc.).
Chances are the games launch to the same resolution until you get past the menu screen. I would launch the game, start a game so you're actually playing, then switch the monitors and see if that works. That will at least narrow down the problem.
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