Mount Point Folder May Disappear in Share Folder in Windows 7
You have a share folder which contains volume mount points in Windows Server 2008 or Windows Server 2008 R2. Sometimes the mount point folders appear as "hidden" when you navigate through the content of the folders and clicks "back" in Windows Explorer in Windows 7.
This is a known issue of SMBv2.
As a Workaround, you can create the following Registry key on the client machine:
Navigate to the following key:
Create DWORD DirectoryCacheLifetime and set it to 0