The LG television works fine but the squeezebox is very old & long before chrome cast etc.
I was hoping that someone with a connected device might be able to help.

MediaMonkey 5 added Chromecast Support. Streaming to the LG TV works?

Sorry but I'm not at all technical. I don't think that the Squeezebox can browse DLNA servers. MW5 shows my LG television as an alternative output device.
I know that MW4 was linked to the squeezebox using an add on program called MonkeySqueeze. I was surprised when it appeared as an out put device when I switched to MW5.

Presumably this is a DLNA capable device? Can you browse DLNA Servers directly from it? If so, does it see the MediaMonkey Server.
Do you have other DLNA capable clients on the network, can MMW still see them or can they still see MMW Server?

When I first switched to MM5 my Squeezebox was listed as a playback device. I have just started to use it again but it is no longer listed. I am using the latest version of MM5 & have my Windows network set to 'Private'. Is there anything else I should check please?