The cause of this problem is the remote login feature of Vision Pro changes one of the .dlls Windows uses to log on which is also apparently customized by the Novell client and a number of other specialized clients log-on software.  Once installed Vision overwrites the Gina.dll entry on this page.  Restoring it should resolve the issue.  To do this, first, do the following on a machine that is working correctly currently.

1. Click Start, click Run, type regedit in the Open box, and then click OK.
2. Locate, and then click the following registry sub key:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon

 3.            Click File, click Export, type exported-winlogon-key in the File name box, and then click Save.

Then just import the .reg file on a computer that has the Vision client installed on it while logged in as an administrator.  Reboot.  This should restore the original functionality.  

If you have not had the issue occur yet, you can back up the registry from a system you are about to install the update on and then use that registry backup to restore the settings.  You would just install Vision normally and run the .reg update after Vision has installed and before restarting the computer.

As of Vision 7.4.1 you can now choose to not install the mass logon feature as part of the advanced installation options.  When you do not install the mass logon option this issue will not occur on machines.  During install, via the student go into the advanced options and uncheck 'Install mass logon authentication provider for Windows XP'.  The same can be done when creating an MSI or installing via the teacher software.  

Note: If you employ either of these fixes, the remote login function on Vision Pro will not function.