If Force password change, is set to anything other then 0, and the user is banned by username (could be ip, did not test that) the banned user will get a error (see attachment) to line 1856 of /includes/session.php

http://www.phpbb.com/community/viewtopic.php?f=46&t=1657475 is the support topic i made before i figured how to replicate the error

Now, i dont think session.php should be checking if the users password should be changed if they are banned, perhaps a check to see if the user is not banned in the if statement?