What do you do when your NXT program isn't running on a OSX MacBook?

If your NXT program isn't running on a macOS MacBook, first ensure that your software is compatible with the OS version you’re using. Check for any updates or patches for the NXT software and install them. Additionally, verify that all necessary drivers are properly installed and that your NXT brick is properly connected via USB or Bluetooth. If issues persist, consider reinstalling the software or seeking help from online forums or support communities.