I ran into an issue where I mapped a few network drives on Windows 8, and when I was using an application as administrator, they wouldn’t appear in the file browser. Apparently this is because drives mapped as user X are not available to other uses (even the administrator). Strange.
Anyway, there is a policy registry key called “EnableLinkedConnections” that will enable the mapped drives to appear when running applications as an administrator. Use this reg file or see below.