Was working on the facebook API earlier and ran into a wierd problem where the JSON decoding was causing some conversions to go awry for reasons I didnt have the time to investigate. But basically it was causing very large numbers to get round off towards the last few digits. Went to the SVN and grabbed the latest copies from the repository and its working now. So all those who downloaded the default copy on google codes might want to update your JSON libraries if you encounter a similar problem.
Link to online browser of repository: