I don’t know how to change this annoying effect - that came along with 3dsmax 2013.
The Perspective Background Color is always slowly changing to black - I have no idea how to fix it.

I already changed the viewport background setting from “gradiant color” to “solid color”. Futher i changed the viewport background color to light - but the gradiant change of the backround to dark is still there. Please, can anybody help me??

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This has already been answered. The viewport settings (gradient/solid) are per scene, not global, therefore the only way to have your preference kept is to set it up in an empty and save it as Maxstart.max. More on Maxstart can be found in the help.

Max 4.2 through 2014, Composite 2014.
XP-64 (SP2).
nVidia 9800GTX+ (512MB) (Driver 314.22).
i5-3570K @ 4.4GHz, 8Gb Ram, DX9.0c.