It could happen with the v6 too because if a staff member sees you in a peer list with a unrealistic upload speed they'll ban you at once. If you use a fakeup or multi mod you've to take a look in the peerlist of your tracker from time to time that you can check the max speed of other peers and regular you upload rate after it. Never use a report seeder mod if there are only many seeders and less leechers in your torrent. There are many way to cheat effective without getting caught. You must only think about the correct settings for each situation...
If you want i can check the version you've used that day if there is a difference to v6 but i don't think that i can find anything...