Thanks for your suggestions Martin. I'll work through them and then repost my findings. I think my phd and byeos are up to date. I've haven't updated ASCOM for some time. that might be it. It's just odd that it stopped working even though I haven't changed any settings. I was imaging the Leo triplet last night and tried a manual type of dithering by turning off the guiding for 20seconds every 10th image to allow the error in my sidereal tracking to change the position of the stars on the sensor. It's a bit labour intensive but will see if it worked after stacking. Cheer, Rob.
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