Hi Puybaret, your help has unfortunately led to no result, I'm with my latain at the end.
I try to explain that again. When I start the program, and when I am working on it, it is about 5 minutes well, but then it begins to distort the surface with the mouse, and then the surfaces overlap, but is only optical, I must Then look blind with the mouse buttons.
As I said today I have even updated my graphic card an update.
You have created a great program, which also gives me pleasure to work with it.
I hope you still fall which one could possibly make, I think however I am not the only one has such a problem has.
With kind regards Gadi