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Peter,
Not that I can explain it but I was getting massive , random, spikes on both X & Y axes on my MX. On good days (nights) I guide with usually <0.5 error but the spikes were ~ 26.0 with an odd excursion >45.0. I did notice that the guide star centroid definitely did not move that far and eventually came to the conclusion that the spikes seemed to develop with variations in the brightness of the guide star. Targets where I was lucky to get a bright guide star had few or no spikes. I can't prove this and I haven't had a clear sky in about 3 months so I can't test anymore. I just bought the SBIG Guiding Kit for my ST-I as that looks like it will give a brighter and larger FOV for the guider so I will see what happens when I get a clear sky.
Charles
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