No solution has been offered. ..none that fix this problem anyway. I, too, bought the MX922 scanner specifically to convert multi-page, two-sided documents into PDFs by means of the Automated Document Feeder. (I didn't even need the printer functionality.) One firmware update pushed by Canon actually helped correct the problem a little but not completely. The missing strip at the top of the page (or bottom of the back side) used to be larger, now it's down to about 1/4"
For the issue being experienced, we ask that you please contact a Canon technical support representative here so that detailed troubleshooting can be performed. A representative will be happy to assist you free of charge.
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