Robin,
Have you tried doing Pinpoint solves on all the image files and saving them before you calibrate? IIRC, Astrometric alignment won't do a new plate solve if you've previously done one (and the FITS headers have been added to reflect this). This might be a workaround at least. You can tell Maxim to automatically do a plate solve for each image as it is acquired.
Cheers,
Rick.
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