Hello all, that's great to give a try to a mac version :-) Thanks for the work! I tried to run the examples (2354) from the command line and couldn't go farther than scaling the model. here are the end of the outputs of the terminal : Step 3: Placing markers on model Loaded marker file /Developer/OpenSim202mac/examples/Gait2354_Simbody/subject01_static.trc (49 markers, 300 frames) Averaged frames from time 1 to 2 in /Developer/OpenSim202mac/examples/Gait2354_Simbody/subject01_static.trc (frames 61 to 121) Deleted 0 unused markers from model subject01 Marker Tasks: Sternum: weight 1 from file (columns 93-95) R.Acromium: weight 1 from file (columns 96-98) L.Acromium: weight 1 from file (columns 99-101) Top.Head: weight 1 from file (columns 144-146) I removed all the markers here L.Midfoot.Lat: weight 1 from file (columns 87-89) L.Toe.Lat: weight 1 from file (columns 132-134) L.Toe.Med: weight 1 from file (columns 135-137) L.Toe.Tip: weight 1000 from file (columns 90-92) Unprescribed Coordinate Tasks (with nonzero weight): subtalar_angle_r: weight 1000 constant target value of 0 mtp_angle_r: weight 1000 constant target value of 0 subtalar_angle_l: weight 1000 constant target value of 0 mtp_angle_l: weight 1000 constant target value of 0 lumbar_extension: weight 1000 constant target value of 0 Solving IK trial: Using Ipopt optimizer algorithm. U???8?]?u??}?? U???8?]?u??}?? Bus error I don't understand why I have to run an Inverse Kinematics step during the scaling. No model is created and I can't run the IK command after that. Thanks in advance for the answers! Best regards Guillaume %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Guillaume Rao, PhD Institute of Movement Sciences University of the Mediterranean, Marseille, France. E-mail: guillaume.rao@univmed.fr Phone: +33 (0) 4 91 17 04 22 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%