I think it happened only once that I didn't get payed but usually after a lot of patience the results are coming. It takes time until I get rewarded. Maybe you have to give it some more time.
Often ICO projects take a lot of time to get soft-cap and then hard-cap (many projects can not). So I think that when the bounty hunter joins the bounty, it should be determined that it will take a long time to receive the token.