I don't even know what this arrow means...
Me, neither. But it looks like it's there by intention... I'll see if I can find some documentation for it, probably in the source code. Let's assume, it's not a bug for now
For the scenery download: If you use the new built-in feature from the menu "Environment->Scenery Download", you specify a "Target Directory" which is the place on your harddisk where all the files get written to. You may browse in your Finder to that location and check if there is anything within this folder.
FlightGear needs to know that it has to look in this folder for scenery. There is a note in the "Automatic Scenery Download" dialog saying "Remember to add target directory to your fg-scenery path list". I don't know Tat's launcher for FlightGear, so I don't know where you can add this (the first app, I open under MacOS is the Terminal, so I have a command line). If you find a place where you can add custom parameters, you need to set
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--fg-scenery=/same/as/in/target-directory
For the multiplayer: my system runs happily on multiplayer without the multiplay=in,xxxx option. A common pitfall is an active firewall (you need to open UDP port 5000) on your Mac and on your DSL router.
flightgear.org - where development happens.