Roon on Antipodes DS Server not playing

I have had no problem with this for 3 years. Today, Roon can no longer see the Antipodes as an output. It can see various networked ‘Zones’ around the house, but I can’t play via USB to my Hegel DAC from the Antipodes unit as it no longer shows up as a ‘Zone’ in Roon. I’m not sure if this is a problem with Roon, or with the Antipodes server. Any advice would be appreciated.