all your rejected hits are due to the reason 'too many didn't load selected'..it is clearly instructed not to accept hits exceeding certain no of unloaded images...I have been doing their hits ever since i joined MTurk 2 years ago...so far no problem with them and they promptly cleared all doubts regarding their hits...from the discussion i understand that those who strictly adhere to their instructions regarding categorization have no problem with this requester.