When i try to trim a line between two cutting edges, only one of the two edges works. As a result i cannot trim, even if a draw a new line exactly at the same location as the cutting edge that does not work.

The first image (xxxxxxx1942.jpg) shows the cutting edges i select.

The second shows the result of trim.

It's not the first time this happens, I have the impression that trim suffers a bit, please fix it!!!!

(i have searched for errors - i have cleaned file, which is rather simple, only a bunch of lines, and i use latest version V1R1.2)