Hi all, just to let you know this issue has now been resolved, for anybody else who may experience this random issue, The solution may not what you may expect, It certainly was the last thing I would have thought of;After several issues with my site, I decided for a fresh start, and installed Joomla 1.5.23 from the back end. In a lapse of concentration I did not un-tick "install sample data". This therefore created all of Joomla menus, including the user menu The user menu automatically sets itself up as being SPECIAL. What this essentially does is when you click "register" in the k2 login module, ACEsef picks up that this link (account creation link) is in fact only for special users, thus redirecting to an admin login area. Upon deleting said menu, problem solved. I hope this can help anybody else who may have this issue. I don't know if K2 community can archive this for anybody else searching in the future, many thanks,Jasper.