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Nominals From CAD?

I have just started using PC Dmis on a Romer and I've got a question that I hope some of you can help me out with. I keep loosing my nominal CAD values when I take a hit on a part. I have to press the middle button and then the done button to take a hit. However, the nominal values are replaced with the actual location of the probe rather than the theoretical location on the feature on the part/model. How do I stop that?

Also when I accidentally hit the button on the ARM with no dot, my pointer on the laptop screen goes crazy. How do I get control back of the pointer without having to shutdown PC Dmis?

Thanks