User data saved in the wrong place on macOS
.armagetronad/ instead of Library/Application Support/Armagetron Advanced.
The old xcode based builds did it correctly, but the unix style builds forgot to pull that over. If you have been using the new macOS builds and want to keep your configuration, you have to move it; presumably from .armagetronad-alpha to "Library/Application Support/Armagetron Alpha". Note that both .armagetronad-alpha and Library are hidden by default in Finder.