[softwarelist] Transparent GIFs, PostScript and PDF

Just to put another cat among the pigeons ...
Consider a transparent GIF (B&W image on a transparent background) placed in a picture frame within an OPW document.
1. Print to file with DirectPS selected (overprint off) and image appears in the PDF as it should -- except I have an uneditable PDF, which in this case is not what I want.
2. Print to Acrobat Distiller (or to file with DirectPS off, and then to Distiller) and the picture appears in the PDF as a BLACK rectangle.
3. Drop the GIF into MSWORD and print to Acrobat Distiller (same settings as above) and the image is visible in the PDF.
So, why am I getting the black rectangle using method 2? Can anyone suggest how to resolve the problem and still get an editable PDF? 
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C.B.
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