[Gimp-user] blured text on PDF-export

[live hushmail com]

Dear Gimp developers / users,
recently did I worked on some PDF-files. I was very pleased how easily
you can import PDF-files and have the full range of tools available to
modify these files inside Gimp.Unfortunately all text got blur out as
I exported the documents back to PDF.
Do you know any way to avoid this blurring during export?
With best regards - 
Alex