I had a similar effect with lost lines at equal distances when I
implemented my backend (coming soon) for the Paragon 600 II N.
My explanation for this:
The fix_line_distance() function loses data when it is called
multiple times with a stripe of given height each time.
Possibly, this does only apply to the fix_line_distance_normal()
function and only if the scanner does not already correct it.
Also to say, the stripes only happened in color mode, not in
grayscale mode.
It's well possible that I'm wrong and that your problem is rather
related to the SCSI part of the implementation.
Regards,
Andreas.
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