Strobelight - LightBoost Utility for AMD/ATI and NVIDIA

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I can see clearly difference in my brightness when i am in the desktop, while switching from non-strobed to strobing, but when i am playing some game and i am using CTRL+ALT+plus/minus to on/off light boost, i can't see any difference in brightness level. Furthermore when i use alt+tab to minimize my game, it takes 10 seconds to do it, while i am using light boost, and only 1 second when i am not using it. It's seems like it's reinitializing displays every time i do it.
When i started using LB first time few months ago i don't remember that issue.
I am using BENQ XL2411T.