Thin lines appear after flattening PDFs

Hello,
Whether we export a layout using one of the PDF/X standards or tell Acrobat Pro to flatten afterwards, the file appears to have thin white lines bordering all the previously semi-transparent areas. Upon zooming in as close as possible, these lines appear to be very negligibly thin and thus not likely to appear in print. However, this of course makes the PDF unusable except for printing (it looks bad at normal zoom with all these random boxes).
Is this normal behavior or should we be choosing another PDF preset or PDF exporting method? Has anyone had any problems with commercial printers showing these artifact lines?
thanks,
JP

The flattener creates what is referred to as "atomic regions" as part of the flattening process...basically it divides the content up, creating or maintaing vector objects and rasters as needed. After flattening, these "artifact" lines are sometimes visible at those atomic region boundaries if, in Preferences under Page Display > Rendering > Smooth Line Art is turned on. This setting has a tendency to exaggerate those lines, which is what you are seeing. When printed they should not be visible.
Can the files be saved as PDF/X4 which supports live transparency? Keeping the transparency live should also mean a smaller file size than a flattened file.

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Thin lines appear after flattening PDFs

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