This particular problem was caused by Visual Studio projects referencing a DLL on a (mapped) network drive. The file server is running Windows Server 2008, and the client (where VS is running) is running Windows 7. Therefore, SMB 2.0 is used between them. SMB is a protocol used to transfer a network file.
Disabling SMB 2.0, returning to SMB 1.0, on the client resolves the issue. http://www.petri.co.il/how-to-disable-smb-2-on-windows-vista-or-server-2008.htm
Thomsen
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