Hi CuriousG,
This is a new one and has not been reported before.
A couple of things we need to check is what versions of PHP are you running on the source/destination sites or are they on the same server.
Have you installed Export Content 1.7.0 on the Joomla 1.0.13 site?
And Export Content 2.0.0 on the Joomla 1.5+ site?
Ok assuming all that is correct the problem may be because Joomla 1.5 is running into a character it's choking on.
Back when Export Content was still being tested and trying to cover as many languages as possible I run into a similar issue when there were certain Korean characters in the article text.
Everything would import as expected but the text would only go as far as the first character it did not like and the rest of the text would go missing.
The odd part was that if I checked the database tables everything was there, it just would not display.
Joomla 1.5 was still in Beta at this stage so I assumed it was a problem with Joomla.
All that said it may or may not be what is causing the issue so if you can workout where it is being cut off and see if it's the same character or characters where the text ends we may be able to come up with a work around.
