I'm not stating what the problem was, but stating what problem this COULD HAVE made. It could be I'm correct, though I don't think this is it. But these types of things can make those kinds of problems. Hud color wouldn't, since a server doesn't affect the hud's color, simply what is shown there. That is not server-side at all, and solely client-side.
The hud colors were banned because they might have been causing server crashes, game instability, and CTDs. I know the same ones that worked for Nightfall made me reinstall FL because it screwed up my files.