In MC release 21.0.51 the following change was introduced :
1. Changed: Zone links are tied to the zone GUID instead of the zone ID (so linking to a DLNA device should work better).
Since MC release 21.0.54 to 21.0.90, Zone unlink doesn't work anymore in JRemote. The link is establish but the icone "Link" remains green and we have to use Media Center on the desktop to unlink.
Still doesn't work with MC 22.0.8
This made me curious, so I tested it with MC21.0.91 for Mac and EOS remote for Android. EOS can establish a link between two zones and they link properly. However, if you try to bring back the "link" screen (which is where you link and unlink zones) in EOS, it crashes EOS immediately. There's no way I've found to then unlink zones, without going back to MC's Standard View interface. Once unlinked, you can link again if you want, but again, you're stuck because the link screen will then crash the remote application.
So, I reinstalled MC21.0.50 and tested again. This time the results were normal: EOS can link and unlink as normal. Proper operation and no crashes. So, I think the above change broke functionality that some remotes use. I'm guessing the default value of the zone ID or type has changed and that's what confuses JRemote and crashes EOS. Just a guess.
Brian.