I have just downloaded and started to use Jasper Reports 3.5.3. Our main motivation for upgrading (besides bug fixes) are in order to use the new DOCX exporter.
However, it seems that the documents produced cannot be opened by Word 2007. It appears that the document is missing a semicolon somewhere.
I have attached the .docx report, the .jasper source I used to generate it and a screenshot of the error in Word.