We had the same problem with CAREERS proposals.  Our scanner saves at
acrobat 4 if we save as a pdf file directly from the scanner.  Our
solution was to rescan everything and save it in pieces.  We then joined
the in Acrobat but did not save then using the file save, but through
the "print" button using distiller option which saved it as acrobat 3.

It was cumbersome, but it did enable us to get the proposal sent.  We
printed a copy before we hit the send button, and it looked OK to our
PI.

Sharon

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