eq has stupid settings spread all over different kinds of ini files, the settings you mention, i believe is in the shared eqclient.ini
so if you log in a couple guys, and change the color on one, thne log him out and then after he is logged out, log one of the others out, its gonna be like hey i have this setting like this, lets save it cause we logging out.
and then you just overwrote the setting you made on the first guy
i suggest try logging in one toon only, make your changes, zone, then /camp desktop