I am using Atom Lite. It's the one from ATOM Stepper Motor Driver Development Kit (DRV8825)
I am using UIFLOW(LITE) v1.9.8 downloaded using the Burning Tool
I checked if the Burnning Tool would update the UIFLOW version, but I did not download the newest Burning Tool version. That must have been a mistake.
Now I downloaded the newest Burning Tool with UIFLOW 1.11.0 on board and it is working correctly.
Thank you Felix. Much appreciated!