Unable to trim more polylines with the classic selection window

Good morning everyone. Since I installed draftsight on a new PC, despite having imported the settings that were present on the previous PC, I am no longer able to cut more polylines with the classic "bottom-right - top-left" selection window. I have searched everywhere on the net, but I have not been able to find the solution, and I am quite desperate !!
I enclose an example of what happens to me. The command ends with "error" ...