can't subtract extrusion solid from another solid

 From:  Karsten (KMRQUS)
8624.6 In reply to 8624.5 
Hello Pierre,

and there is also a difference in the direction of the window selection: Dragging a window from Left to right selects everything in the box - From right to left: everything in the box and also everything is crossed by the box.

Have a nice day
Karsten