I was having the same problem trying to test 6.5 before upgrading. Glad I found this post. It says in the config to "only disable if there are many users having problems due to firewall". So tell me, what exactly is the purpose of the referer check? Does disabling pose a security issue? If not a security issue, then what benefit is there in leaving it enables. And last but not least, there are so many firewalls out there. How can I leave it enabled and give instruction to those affected on how to correct the problem?
Thanks