Dashed Table borders do not render correctly when PDF created from MS word 2013

I have a defined format for many documents which have all been created in MS word 2007.  Never any problem creating PDFs of  these using ADOBE XI Pro.

Updated to MS 2013 and now when converting the same doc to PDF all dashed borders around tables render as solid lines. The only time they render correctly is if I PRINT to PDF.  Printing to PDF is not an option as I create batches of many documents at one time, so would be to time consuming.  This was an issue when i considered upgrading 2007 to 2010 a couple of years ago, so caused me to delay upgrade.. upgrade is now required.

I have a sample of a document if required.

thanks