Not to sure what you mean except for the environment cube lighting. If the EC or skybox is brownish red, all the ships will have that sort of reflection. You can try in the options to change deep space skybox or plane skybox.

thx guys

on the strategic view, the box on the right side of planets show colors as they should be (grey for rebels, faction's color insignia ...), but the ships colors are all brownish red, both on strategic and tactical views ... whatever the faction.

edit

The problem came from the Video options.

The Team coloring was selected and threw everything out of whack

problem solved. thx for your help