I have upgraded a SharePoint site from SP2010 to SP2013 and everything is working fine apart from the fact that whenever I create a new document I am prompted for username and password. I can save the credentials but after rebooting the PC it forgets the authentication and prompts again.
I have set up new sites on the same server and they do not have this issue.
I have the site address listed in the Local Intranet zone and everything is the same as what it was when running the SP2010 site.
Help!