I updated my iPhone 4 to iOS 4.3.3, restored, and then jailbroke with Redsn0w rc15. Everything went well. All my apps were on my iPhone. From Cydia I installed "Aptbackup" and pressed the "Restore" button. I thought this would restore my apps from Cydia. What it did was delete all 3rd party apps. The original Apple apps are there, but nothing else.