I had a super hard time getting JSON data to populate… it ended up being the way that it was connecting to the database.
Assuming that your files are setup properly on the server (I made sure mine were by manually populating the data without any JSON or XML calls)… what I did was replace the “dbconfig.php” call with my own connection document, and then replace the “$db = ” in my server.php file with my own connection item.
Any chance you could paste your entire server.php file? (excluding your login info, of course).