If your MYOB is running as Administrator, and you have User Account Control turned on, MYOB may be unable to access some network locations.

This problem occurs because User Account Control treats members of the Administrators group as standard users.

To work around this issue, use the net use command together with a UNC name to access the network location. For example, at a command prompt, type the following command, and then press Enter:
net use \\<computername>\<sharename> /user:<username>

To fix this issue permanently, we need to configure the EnableLinkedConnections registry value:
  1. Start regedit.
  2. Locate and then right-click the registry subkey HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System.
  3. Point to New, and then click DWORD Value.
  4. Type EnableLinkedConnections, and then press ENTER.
  5. Right-click EnableLinkedConnections, and then click Modify.
  6. In the Value data box, type 1, and then click OK.
  7. Exit Registry Editor, and then restart the computer.
Now programs/applications that are running as Administrator will have access to the mapped network drives.