I'm not 100% sure but I believe what you and Jeff ran into with Error Code -60 is a new issue with the 5.0x 64-bit version of the Amyuni driver running directly (logged into the console) on a 64-bit server o/s (e.g. Server 2008 64-bit or Server 2012 which is only 64-bit) . IOW, it's not a 2012 specific issue as article says but RDP and Citrix connections do work as it says.
The new Amyuni driver gets installed when you run WksUpdate Standard or WksUpdate Advanced after installing PU4 (2013) or PU8 (2013). There are also updates to MAS programs ( Sy_PDFConveter, Sy_ReportEngine, etc) to support the new ""Sage 100 PDF Converter"".
Despite this issue this Amyuni driver is superior to the previous 3.0x version and should have been in place 1.5 years ago. Kudos to @JohnnyPabian for that his visit to Sage to talk to PM and to John Nichols was more influential than the hundreds of cases logged by Support.
Ex: In both regular and high security environments, you can keep the default NUL: as the printer port (don't need Sage port or public version of Sage port) and it sets the printer permissions correctly to begin with. Hopefully we will discover a trick to work around the error code -60 issue. In the meantime here's an updated version of my doc.