Many peoples torrent clients are all of a sudden saying that they are using a banned client, even when it has been the one they have been using since the beginning. This is a bug or mistake that has been happening since the whitelist was updated to include the newest version of the Transmission client a short while ago. Unless your torrents stop working, you can simply ignore the message from your torrent client. Just about everyone has them still working fine.
There is no need to flood contact staff, the forum, and the shout box about it. We are aware of it, and it will get worked on when it can.