the deleted post seems to be an issue with Nabble, maybe it returns again.
However, the solution was to enter relative coordinates with a leading @.
Enter coordinates, e.g. 100,100 is absolute from the origin (big red cross).
Enter @100,100 is the position 100 to the right and 100 up from the relative zero position (small red crossed circle).
investing less than half an hour into Search function can save hours or days of waiting for a solution