I understand your concern but will note that in a year and a half, Ive never seen this problem mentioned.
It sounds like either your sessions are not getting written to disk. As Anthony suggested, double check /sessions to make sure you see some files there. Try deleting all of them and then accessing admin again. Make sure that directory is writable and/or owned by the correct owner (root, www-data, etc). The other thing is if cookies are getting blocked for some reason. Could be a Firefox security setting blocking mixed security cookies or third party cookies. Unfortunately, Python deployment remains tricky, especially on shared hosting.
