The next question is "Serial port". However, as is stated in at least one of your web pages, no modern MACs have a serial port. The Web page "Connecting JMRI to a Digitrax DCS240" says in its first ...
On a first build of current master 4.7.4ish (in IntelliJ 2017.1 IDE on macOS with Loconet Sim and MERG Sim, English locale) I frequently see this during PanelPro startup, stopping with the splash ...
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