Checked everything ...
Works from home, doesn't work from the office with the same setup. Works from office through VPN, but it has nothing to do with IP's ... works from specific computer on FF, but not from my laptop with FF .. does not work on my laptop with chrome, but DOES work with my laptop and chrome from home ... etc etc.
I think it's a user agent code that is constantly being identified differently, but also that doesn't make sense ...