DLNA Servers' Broadcasts Blocked if uPNP is not Enabled
I quickly localized the trouble to the DIR-655 by connecting the beach house feed directly to a render, bypassing the DIR-655. With this configuration, the DLNA Servers appeared and were functional on the render.
Obviously, something was blocking the DLNA Server broadcasts within the DIR-655. A few trial and error parameter changes pinpointed the trouble to the uPNP functionality being disabled. Actually, it was my first test as DLNA broadcasts and uPNP are very similar.
So, if your DLNA server is broadcasting through a Dlink DIR-655 and possibly other models/brands and your renders cannot detect the server, try enabling uPNP if it is disabled.
In the DIR-655 this accessed from the GUI main menu-Advanced-Advanced Network tab.