AutoCAD Inventor :: Picture Becomes Too Dark?

My Inventor screen picture became much dark as used to be.

For example all my aluminum parts became too dark and too grey.

My office machine has excellent picture within the same settings of Lightings.

Here is video link attached. If I set more Bright the picture becomes closer as used to be but it used to work fine at 50% and my office machine is also perfect at 50%

Either it about the setting of Inventors or my videocard ?

I've got this problem after the successive series of program crushes.

There is only Inventor has this "dark picture" problem. Other programs works fine.