[demosthenes2k8]

Without seeing any code, may I suggest putting the "bad" CIM onto a jaguar that you know works, and put a "good" one on the jaguar that you think may be faulty? That will tell you if it's the CIM or the Jaguar.

If it's the jaguar, the next step is to use BDC-Comm to set voltage to two different jaguars, the good and the bad, to the same voltage, then use its output to see whether the speed is the same (roughly). If they're not, it's probably the jaguar itself. If it is, it's probably something in the code and you should check your logic carefully.