I had written a comment on one of the torrents and tried to upload it while I wasn't logged in. When I did log in, I couldn't recover the comment I'd spent time writing.
This seems to be part of a more general problem that the server doesn't keep track of where the user was before being asked to log in. (Such info could be included as hidden values in whatever form the user is asked to submit to log in, so that the server wouldn't have to "remember" anything.)

