Yes, that is correct the browser URL has not changed.
At the moment functionally internally is OK.
No, the browser is not prompting to accept a cert. Via Chrome I see the "green pad lock icon" 
. Yes login is successful (but I need to login twice as explained below)
So in order for the site to work externally I need to login twice. Once via the browser popup and then again via the Horizon login screen.
If I do not login to the browser popup and hit escape, then just log in to Horizon then the applications tabs does not display any ThinApps.
Thanks again for your response.