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If you think your crosshairs are skewed in any way, try resetting the SNAPANG variable to "0". The two different colors you see are AutoCAD "tinting" the different axis (one for X and one for Y). If you changed your viewpoint to one of the isometric views, you would see a third color for the Z axis. To turn off the colors uncheck the "Tint XYZ" box in Options>Display>Colors.