ReadyNAS Duo Print Server w/Windows 8?

Lexmark E450dn works fine "print served" from ReadyNAS Duo (latest 4.1.10 firmware) to Windows XP machine but not Windows 8 64-bit laptop. Printer is seen on the network OK, path is correct as \\{ReadyNAS Name}\Lexmark-E450 and Windows 8 box seems to "connect" but will not "Test Page" (or any other page) print. Neither Windows 8 printer or ReadyNAS print queue shows documents pending or processed. And again, all this works as expected from Windows XP.

Anyone have Windows 8 OS working through ReadyNAS Print Server service? Any ideas?

Thanks,
Bob