Hi Bob,Thanks for your reply. Strangely enough, I ran the AutoguiderCalibrate script again last night and I got a very nice "L" shape. I had not physically touched the imaging train in the meantime (it's a fully remote setup). How can this be? One day a "V" and the next an "L"... From that point on, autoguiding succedeed.Yes it is Christian Hennes account for our shared setup. Shall I contact him to update our account?Francois