In ROBO Pro, the settings dialog for "Motor output" block/object offers only 4 outputs (M1-M4) so the Arduino Uno "default" LED on pin 13 is effectively inaccessible with current pin assignments (pin 13 is on OUT8).
Would it not be more logical to assign the LED/pin13 to OUT1, for example?
(Yes, I've already done that in my local copy but I'm suggesting it as an update to the project.)
Or am I missing something?