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Hello!
I also use CCDSoft and internal ST2000XM chip for self-guiding. In 90% of cases "invalid motion in X or Y axes" means that you have another star of the similar brightness as the one CCDSoft uses for the calibration in the FOV of the guider chip. For calibration CCDsoft always picks the brightest star in the guider FOV. If there is another star of the similar brightness in the same FOV, or such star enters guider chip FOV during the calibration you will get "Invalid motion" message, because CCDSoft loses track of the calibration star. Unfortunately the only parameter CCDSoft uses for tracking calibration star is its brightness, it doesn't check for star patterns or something else. The remedy is to find a star field with one star that is brighter than the rest of the stars in the vicinity and use it for calibration.
Regards,
Zoran

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Thank you Zoran for that. My method though, is to click on the star I wish to use for guiding. It flashes a square around the star that I choose. Are you saying that it will still get confused with a similar star, even after I have actually CHOSEN the one I want to guide with?

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Meade 10" Lx200-R with Mitty Evolution Wedge
Moonlight SCT Focuser
Stellarvue Raptor 90 Triplet
SBIG ST2000 XM Imager
SBIG ST402ME CCD Guider
Canon Digital Rebel DSLR
Meade DSI-c CCD Guide Cam

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