This is really odd. I couldn't reproduce this. Basically we remove all color codes from the string before it is shown so that it looks better in NotEye mode. But even if the color codes weren't filtered out this should display colored text. But never these special characters. I've changed the code a bit so that is it doesn't use "isprint" anymore (I'm marking this issue as "fixed").
Which OSX version do you use? Does this happen for other characters as well?