RB750G torrents problem

Hi. I’ve just started using my RB750G with RouterOS 5.0rc11 on it.
Internet goes through PPPoE on eth1. Other clients are on eth2-5.
I enabled external UPnP on pppoe-out1 and internal in ethernet2,3,4,5 (uTorrent’s portforwarding test passed ok)
In “Trackers” section of each torrent file I can see that all trackers are in working state but all of them got 0 peers and 0 seeds excepting “retracker.local”.
Because of it I can download/upload only from “retracker.local”
What can be the cause?
Thanks for your answers!