I've started to writing a document under Windows 2000 w. OOo2beta.
Next saved to odt and next day continued working on document under Linux (OOo2B).
I've saved the document, switched to W2k, loaded the document, and the
formatting have lost. Worked on the document, saved. Reboot. Load document (w2k). 
It has said that it's have some document formatting error in styles.xml - i
corrected by hand - and later in the content.xml, i tried to correct but it has
too many error.
The errors are mosty duplicated elements, eg.

<style:style style:name="P18" style:family="paragraph"
style:parent-style-name="Standard"><style:paragraph-properties
xmlns:fo="urn:oasis:names:tc:opendocument:xmlns:xsl-fo-compatible:1.0"
fo:language="hu"
xmlns:fo="urn:oasis:names:tc:opendocument:xmlns:xsl-fo-compatible:1.0"
fo:country="HU" fo:margin-left="0cm" fo:margin-right="0cm" fo:text-indent="0cm"
style:auto-text-indent="false" style:writing-mode="lr-tb"/></style:style>

--
here and mostly elsewher the
xmlns:fo="urn:oasis:names:tc:opendocument:xmlns:xsl-fo-compatible:1.0" always
duplicated