Hi Cornel, by default curve colors are controlled by their style assignments. You can change the default style colors by editing the style list how you want it and then saving a blank .3dm file with those styles and set that .3dm file as the startup template in Options > General.

Or you can do what Ed shows above which will change it so all curves are drawn in a specific color instead of by their style colors.

The LineUnselectedColor in moi.ini that you edited used to control curve color a long time ago before styles were added into MoI. It isn't used anymore for curve drawing now with styles in place but it will be used for a couple of other things like the base color for the faint dotted hidden lines display.

- Michael