I'll look back at that earlier post asap - thanks for that note ... I've been experimenting. Don't know how much this might reveal to anyone with more knowledge than me, but here goes with some (to me) odd results; someone might benefit. Recap: my problem file is one started in CS4 and worked on in CS5. It will export pdf with a foreground script and a saved preset, but not the 'proper' export using saved presets and a background export. I went back to CS4 and opened the original file. I stripped out all content from every page (guidelines, anything) but did not touch anything on master pages (there are about 12 of these in pairs, with linked graphic content and footer text and tint boxes and so on). I exported that as .inx and brought it into CS5. The background pdf creation worked fine (though I'd much rather have the older foreground where I could watch the export for a few seconds until the pdf automatically opened in Acrobat). I then opened the CS5 file with page content and began copying/pasting each page into the new file. After every page, which variously contain linked photos, graduated tints and all sorts of elements, I ran the pdf creation and it worked every time. This could just mean that something was missed in the old file for copying over, or my creating layers again or other changes were instrumental in this. BUT: With the old file still open in CS5, the pdf creation would NOT work. Background tasks stayed at 0 (once only I saw it reach 2%) and I was unable to close the file. The moment I closed that old file (which was saved and merely open in Indesign), the pdf was correctly produced. If I closed that file before creating the pdf, it proceeded immediately. I also noted the creation of locked files (.idlk) for any file that had failed to produce its pdf in earlier tests, and that I cannot manually delete even with Indesign and Acrobat shut down (says they are in use in System).
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