Changing the : to = didn't seem to help. Thanks for the suggestion though!

I don't have a problem when not specifying a server-settings.json file.

factorio@localhost:/opt/factorio/bin/x64$ ./factorio --start-server my-save.zip

Runs and starts up no problem.

But when I specify a server-settings.json file, I get an issue with formatting. And yes I realize i put the ...