I am using Dropbox desktop App on my Mac (home) and PC (work). On the Mac (OSX latest version and Office 2011) everything works fine. But on my PC (Windows 7 Pro, Office 2010) files open as Read Only. If I go to Properties and uncheck "read only" for the file or folder in question, it is fine. But when I reboot, all my Dropbox files once again default to "read only". Can you help?