Redwood rejected my some HITs without telling the reason. When I send them the appeal for my good work with proofs they apologized to me and told that they have an auto approval system by comparing with other turkers answers. which made the problem. And given me a bonus. But the problem now is that I got a black mark that my approval rate went down. I value my approval rates. So I am away from them. I just shared my experience. See this link... http://mturkforum.com/showthread.ph...-SpeechText-I-got-a-problem&highlight=redwood So now I can't get their HITs. So I am not working for them anymore... I blocked them and I don't want to see their HITs.