Yes, SQL browser service is running on both of the 2012 machines and on the 2014 machine.

Ssms on either of the 2012 machines will browse and find all 3 of the Sql Server machines.

I appreciate all the help because I have no idea where to look any more. I have been over & over all the configurations and cannot find anything to fix the problem.

Until I can get this fixed, the 2014 machine is completely useless as a server because in addition to ssms not working, I have several c# apps that require SmoApplication.EnumAvailableSqlServers which also does NOT work - most probably for the same reason