If the piece never comes, then request it again. My peers will ALWAYS send you the requested piece UNLESS you are currently choked or they choke you after the request is received. So, if you send a Request and then read a Choke message, assume that Request will be ignored and re-request it after your client is unchoked. If you send a Request, didn't get Choked, and never got the Piece, then post to the forums and I will take a look at the logs.
If the piece never comes, then request it again. My peers will ALWAYS send you the requested piece UNLESS you are currently choked or they choke you after the request is received. So, if you send a Request and then read a Choke message, assume that Request will be ignored and re-request it after your client is unchoked. If you send a Request, didn't get Choked, and never got the Piece, then post to the forums and I will take a look at the logs.