Chris,
I can't upload the model that I am working on, but I will create a simplified version if I have time.
The mechanism analysis fails because as two cylinders attempt to fully extend, the third is supposed to be static at its minimum length. The extension of the other two cylinders forces the third past its minimum limit. This is expected. The fail point occurs before the the two cylinders are fully extended. I would like to find a way to tell Creo to automatically retract the cylinders at this point and move to the next step of my analysis (one step is equivalent to one second run in the analysis). Otherwise, I have to manually edit the definition for the motors. This would involve guessing and checking the maximum extension of the two cylinders without causing the third's constraint to break.
Mitch