Amazed that you have used PDFx4a for 4 years ;p I know of PDF-x4 and PDFx4p
I have seen text "reflows" as in fonts loosing their tracking from MS documents and the bugg/feature that means that you need to export to PDF-x4 from CS4.
Hope you are not thinking that x4 means for Acrobat 4, because that is not what PDF-X is about. There are screen issues with PDFs whith some viewers and PDF makers, but have found the PDFx4 very stable, if your RIP can handle it. The one scenario that I have seen that has not worked however is when a PDFx1a from CS4 has the font bug/feature it does not help to convert that file to a PDFx4.
Kaiserwilliam if you want to make a better world you will have to be more specific with your observations. What files? where were they from? how were they different? What made the one file work and the other not? Save the file in a folder if you can't debugg yourself. Give the file to all developers that were involved. Was it the software, the font the driver, the configuration, the printer....
remember reading excerpts from a fighter plane logg: the pilot had entered "something broken in cockpit" the technician had logged "something fixed in cockpit". I hope you understand the analogy. I have seen with my own eyes some very incompetent technicians ;p
One problem with troubble shooting is that people give up before they nail down the problem, so we get all these roumours of instability, where we find piles of corpses where the messengers have been shot ;p
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