I'm having problems with the when setting the requiring registration ON. Everytime I do I can not login and end up in a constant loop of logging in... getting success... and then back to the login screen. Everything else is working fine.
I'm not using Norton but I am using Computer Associates (CA). I disabled it with same response. I've also tried another PC without any firewall security on it and have same results.
I am using MODS (Poll 2.0, Events Calendar, Email Spam, Active User Lite, and Site Integration). They all appear to be working properly.
I believe I found the answer in the Redundant Login post. I had cookies set to forum and not website. Once I set the cookies to website, the login worked correctly.