Coddler's Cove JP change?
Despite having some problems finishing this jumping puzzle as well I figured out the cause. The graphics settings seem to be the problem here, when you have your settings on “Best performance”. On this setting, it will not show every ball you should be able to jump on.
When I changed my settings to “Best appearance” it worked and I can show you the difference below :P.
“Best performance”
http://i50.tinypic.com/2hg95qt.jpg
“Best appearance”
http://i49.tinypic.com/ob0138.jpg