I can't reproduce this and I don't understand how it happens. The toolbar print button, the print menu item and ctrl-p are all connected to the same action - i.e. open the print dialog.
The print settings ARE stored between print jobs in the same run of gscan2pdf. The print settings ARE NOT stored between runs of gscan2pdf, so I don't think that that can affect the problem. Perhaps this is the solution to the problem - to store the settings between runs.
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Description: OpenPGP digital signature