I can log in, but every time I follow a link within the tracker (torrent details or account info) I have to log in again. No problem with the forum.
We're (well mostly yeti) are working on upgrading the login system to a single entry point in account merging.
PM or email Yeti at tracker@concen.org personally for any bug reports - be as detailed as possible.
Thanks for letting us know.
The first thing I would try is going to
http://concen.org and checking out your cookies. Also check out that cookies are enable in your browser client.