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Single point measured circle

I have a simple round internal gear with 24 mounting holes on the face. I wish to use single point measured circles but I keep getting "hit one out of range". I've double checked and recreated the probe file and this is 2014.1 so I don't think it's a bug. I've chosen the ZMINUS plane, but honestly, nothing works. I used the same thing on 3 non-related holes and had no problems. could it be that the first three were drilled holes and the 24 are tapped holes? I can change the feature in the model if needed.