In regards to thread BUG: Tabstop exported in PDF/X don't match, there is another problem with vertical placed text.
Again, see the document attached and export it to PDF (NOT PDF/X).
The only solution so far is to export it to PDF/X but this is not possible since this will increase the filesize of the document and will be impossible to e-mail.
Please Xara fix this for future versions.
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