When launching the NoMachine player on macOS 27 beta 7 no window appears. The NoMachine icon in the Dock shows the active application dot.

The issue is caused by the player process failing to detect its launcher, thus causing a restart attempt which goes in loop.

As a workaround, execute the process in debug mode by skipping entirely the launcher:

/Applications/NoMachine.app/Contents/MacOS/nxplayer --nodock

The process executed in this way will need to be killed through the Force quit Apple menu, or with the killall nxplayer terminal command.