Since early last week, when opening Excel files from SharePoint Foundation 2012 the 'Edit Workbook' option has disappared for all client machines running Office 2007 and files are opening as read only EXCEPT for when we are logged on to the local client machine as SharePoint Administrator.
When logged on to the client machine as another AD user (that previously was able to open and edit) but logged onto SharePoint as administrator, the same behaviour occurs.
What should I be looking at for this?