Cfimage inside cfdocument problem

Very strange, but repeatable issue I've run into. I'm using the barbecue Java barcode generator library to generate code128 compliant barcodes which are then handed to cfimage writeToBrowser to finally end up with printable packing/mailing labels. When rendered to screen, everything works perfectly, but as soon as I wrap it in a cfdocument tag, so that we can generate as a pdf for printing on a label printer, I'm ending up with the wrong image on the wrong label in a few cases. It's always the same records that end up reusing an image from an earlier record (and always the same earlier record). I can check in the ColdFusion8\tmpCache\CFFileServlet\_cf_image folder and see that all the correct images were created by the cfimage tag, but for whatever reason, some of the images don't make it into the pdf, but are replaced by a different barcode from an earlier record. I can't see any commonality between the two records and if I intentionally remove the earlier record from the query, the proper barcode shows up.
So, any ideas about where to go from here? Anybody know anything about how cfdocument pulls in images and if there is any kind of caching or prechecking of the images before rendering. I actually checked to make sure the two files didn't have the same MD5 sum to see if there was something happening there where CF thinks it's the same image. They were not the same.
I've tried this on two CF 8.01 boxes with the same result. Always the same records, same images, same problem, even if I limit the query to only the two problem records. I'm totally stumped. Anybody?

jeff.c wrote:
Nope. All grouping and loops are necessary based on the shape of the data and the required output based on the number of labels required for each row in the source query. I'm doing something at each stage of the grouping (although I removed some of that because it wasn't really relevant to the question) to build these labels. I'm quite confident that the grouping and looping is correct and not part of the problem. In fact, I've built a simple test page that removes all the complexity of my grouping and query and will still produce this problem (although you have to have the barbecue library to test).
<cfset bbq = createObject("java", "net.sourceforge.barbecue.BarcodeFactory") />
<cfset ih = createObject("java", "net.sourceforge.barbecue.BarcodeImageHandler") />
<cfscript>
          function getCode128 (data)           {
    barcode = bbq.createCode128(data);
    barcode.setBarWidth( 1 );
    barcode.setBarHeight( 50 );
    barcode.setDrawingText( false );
    barcode.setDrawingQuietSection( false );
    barcode.setResolution( 200 );
    newImg = ih.getImage( barcode );
    barcodeImage = ImageNew(newImg);
    return barcodeImage;
</cfscript>
<cfset list = "00413001811,00403001811" />
<cfdocument format="pdf" pagewidth="4" pageheight="6.0" pagetype="CUSTOM" margintop="0.17" marginbottom="0.05" marginleft="0.17" marginright="0.17">
<html>
          <head>
          </head>
          <body>
                    <cfloop list="#list#" index="i">
                              <p><cfimage action="writetobrowser" source="#getCode128("#i#")#" /></p>
                              <p><cfoutput>#i#</cfoutput></p>
                    </cfloop>
          </body>
</html>
</cfdocument>
The question remains why it fails with, but works without, cfdocument. Does cfdocument introduce a new page context? I wonder. If so, then what -==cfSearching==- said about varring the variables would immediately make sense. Unvarred variables belong to the context of the current page.
Another issue may arise from <cfloop list="#list#" index="i">. You implicitly assume that ColdFusion will process the list elements in the exact order in which they appear in the list. I suspect ColdFusion wont always. It may internally apply some kind of sorting, and begin with the last element in the list.

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I am working on one performance item and I have already applied some changes to the original version.
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