I would like you to look over the three senarios of the following programm
scratch.mit.edu/projects/20687843/
In my opinion it works inappropriately. It seems that the three senarios do not execute simultaneously. The first lines of the senarios of the sprites 2 & 3 are drawn and then are erased.
It produces the desired result if I put the clear command at the third sprite only or if I put the clear command at a senario at the background and insert a wait commad to all sprites.
What puzzles me is that the three senarios do not execute simultaneously.
Thank you for your time.