The Melco Music HD app on my iPad Air2 stopped working on my N1Z server after I upgraded the iOS to the latest version 15.8.3. This is also the case with the mconnect app. The error message displayed is: "please connect the melco compatible device to your network apple ipad music hd app".
I'm thinking that a security patch in the update is causing a conflict with the app to connect to a network device. In my case all my music server devices are listed for access but will not connect to the app.