Think it would be a good idea to mention that Nuke 6.5-6.8 come with a ported version of phpBB 2.0.4, there have been two other versions released since and they get rid of the invalid session problem but not for AOL users, i haven't checked if 2.0.6 solves the problem for AOL users but even if it doesn't making a change to one file will most likely allow them to post, you should also avoid saying in public you will share your modified Invision board, their license states that distributing it along with other things are not allowed