ReSharper won't get license server

I have just upgraded from ReSharper 8 to 9 after we re-licensed it - so our license server is meant to be giving out v9 licenses. However when I try and view my license all I see is a message that says "Free trial period is running. 2 days left". I have the "Use license server" box checked and have both tried supplying a url and letting it auto-detect one. However it never seems to even look for one on the server. Does anyone know how to get ReSharper to use the license server?