Hi Guy If you have more than one language set in the admin main settings page then the second language should already be in the download and will have a "2" after it. For instance, the product name is the pName column so the second language would be pName2. Can you have a check to see if that's there and if not, please let me know?
I was wondering if it would be possible, and useful, to be able to manually determine the list of columns to export from the database? Perhaps by placing the list in includes.php?