Hi Tom,

Were you able to find a solution to this problem. I am experiencing a similar problem right now, and be been unable to find the cause.

I am trying to use the IAA tool with the rolling on surface constraint, but my output data is giving me some unrealistic results. In the middle of single limb stance the muscle contributions to the propulsion/braking acceleration (x-dir) of the center of mass become zero for all muscles. I am not ha...