Windows Server 2012 Standard with Windows 7 Pro desktops. I have one user save a file to a mapped drive location (n:\folder\folder\file.txt for example), and there can be up to a 10 minutes delay on another user being able to see the file is there. The second user can try to view the file via open file dialog boxes or Windows Explorer with no success.
This might not seem like a huge issue, but the user's workflow is being delayed enough that managers are getting involved wanting to know why this is happening.