My iTunes Match keeps "waiting" when it gets to the third step of uploading artwork. I have read the various chat/forum rooms and the support section here at Apple and I still can not find what keeps causing the wait since there are no error codes. The troubleshooting guide of various icons is somewhat helpful, but it is difficult to look through 20,000+ songs for a little cloud icon. I have also read that songs over 25 mins will not upload. How do you select which songs are and are not uploaded to prevent 25+ min songs from being chosen?