I know this is might not be very high on your list of things to do but the rank_3.png image for the bounty modes looks like a solid color to people with protanopia. I know it's not because it's in between 2 and 4 but it would be nice if it used some different colors.
Good to know, thanks!
Walt Perhaps instead of using the same shape, you can add complexity to the rank logo. I can make a few prototypes if you want.
Perhaps they could be recoloured so that the shield is a bit brighter and the rank lines are all simply black? Now that I hear it said, though.. That might not look so good..