Twas asking the OP lol.Yes, I have seen Grey Rep bars. Grey Rep bars are quite common like Aquawhite menitioned if the user is new to BOS. They are neutral, as they haven't accumulated enough rep points. If you do receive a neutral rep, be nice and rep them back so that they can become positive. The same sort of principle works for post counts as well as you need a certain amount of posts before you advance to the next status message displayed underneath your user display picture.