One of those DUH moments, this is what finally worked on the NEW WIN 7 64 OS workstation running v4.3.21. I reran the 4.30PDFDriverUpdate.exe at the server, then uninstalled the client, rebooted, then ran the wksetup again. Client installed a couple WIN 7 32 OS several months back (running FRx). Client picked up several WIN 7 64 OS workstations (not running FRx on these machines). Since I saw the patch on the server, I ASSUMED that it had been installed. Thus I was beating my head for several days. After installing the patch, all is well in MAS land...............