I found that with plexamp 4.6.3 running on iOS I am unable to control other plexamp players. When I select another player running either 4.6.2 or 4.6.1 (headless, MacOS, or other iOS instances) I get the red bar “Cannot connect to remote player” error. The 4.6.1 and 4.6.2 plexamp instances have no problem connecting to eachother. There is a mix of wifi and wired in play and it doesn’t seem to matter what network interface is in use. The only thing I can see that appears different with the problem instance is that one is 4.6.3.
It’s impossible for us to diagnose the issue without being provided Plexamp logs.