Hello Gaz,
Thank you for your message.
Please try disabling showing the Active Directory tree as described
here, since the issue might be occurring because remote machines in your AD also count against the license. In order to disable the AD please to the following:
1. In your Viewer window click
Tools -> Options.
2. Navigate to the
Misc tab and enable the
Hide default domain controller checkbox.
This should disable detection of the machines in your AD that might be taking up the license space.
Hope that helps.