Am 16.05.2021 um 14:00 schrieb Ekkehart Schlicht: Hi, I cannot replicate the problem. I have freshly installed the X13 program for Windows (64bit) provided on the gretl web page. Then when I follow your steps with your data, I'm getting a warning or error window with some messages from x13 (I think), and after dismissing that window I'm getting what I think is the standard results. Perhaps you could try to re-install the X13 program (and then make sure the path is the right one in gretl's settings). cheers sven