I just tried to upgrade to 2.6 - the installation went fine, however now I am unable to login - after logging in, I am always returned to the login screen again.
I know the system has actually logged me in because I can tell from the front end. However I notice the S=0 in the query string so I am guessing it's something to do with the session not being set correctly?
Does anyone have any ideas? I am using structure 3.3.8 if that is of any help.