I tried to write a signature, and when I tried to use color I wasn't able to. And when I was typing this, I realized I couldn't use it here either. If I highlight the text and then choose a color it works, but otherwise it doesn't operate like it had before. Thanks!
That may be a personal issue, because I've tested out a bunch of colors, and there seems to be no issue. I'm sorry I can't help. -steve