This is actually a bug that has been reported already. Here's the link: http://sourceforge.net/tracker/?func=detail&aid=3201838&group_id=171425&atid=857928
... it doesn't look like this library is supported anymore, the issue has existed since mid 2011...
We've been put off by the json-lib library not being officially supported anymore, and decided to switch to gson. This issue can be caused by too many places in our code to not have any good fix or workaround.