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2011 : focus detection error

I have 2010MR3 and 2011 on the PC. I can calibrate the CMM-V with no error on 2010MR3. I built the same probe on 2011, and the calibration stop with this kind of message : "Focus detection error in one position".
I have only two choices : retry or cancel. If I retry, it's the same, if I cancel, the probe is not calibrated !!!!!
What can I do ?
(I prefer 2011 for some fixed bugs on tool changer...)Confused