Thanks Willr,
it's not a 404 page, /admin redirects me to the custom error page with the custom message what i have in the CMS.
So, it can't resolve 'admin' for some reason.
When I use '/Security/login' it takes me to my login page. I try to log in and it logs me in but stays on the same page, displaying a 'Welcome back..' message?!?!
It doesn't take me to admin, doesn't redirect me, nothing!?
My $Form variable is their, all the directories exist, its just stopped working for some bizzare reason.
I read maybe it could be something to do with someone else logging in as the same user on a different computer and failing to log out, session issue or something.
I've even emptied the temp cache and still no joy. very odd??