1. You are talking about first disabling contraints and then enabling them? How do I do that in one single call to the CMC tool? I assume you main the FD algorithm as part of the CMC tool. Otherwise I don't understand it. 2. Which constraints are you talking about? I only have a single WeldConstrai...

I think I found the cause of the CMC tool crashing. To run CMC correctly, you should disable constraints. However, when using the FD tool, make sure to enable them. Also, be sure to lock `bJoint_3` and set its value to 0. I hope this information is helpful to you.