Color controls disabled

[igraws]

I did the following:

1. Clean install of Windows 2003 Standard Edition.
2. Windows Update site with all updates including DirectX 9.0b and the latest driver for my GeForce 2 GTS.
3. Installed BSPlayer (bsplay100.805.exe)
4. Opened MyMovie.mpg
5. Went to Color controls dialog (Video > Color controls)

I found all slidebars disabled (greyed out). How to enable them?

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Additional info:
I only did those 5 steps with restart computer after each install.
I did not install any other programs.
I did not change any option in either BSPlayer or video card configuration.

Additional questions:
Is it ok for those controls to be disabled?
Why could that possibly be?

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I thoroughly searched the forum for solutions but had no luck.

Thanks.