Jailbreak iphone 3.1.2 cannot sync apps

I appologize if i ask the same question in this thread. Perhaps someone can guide me on how to resolve this issue.

I recently jailbreak my iphone 3.1.2 with pwnage 3.1.4 on my snow leopard. I have installed hackulo.us (AppSync for OS 3.1 & Installous) using Cydia. Now, I can sync and run cracked apps on my iphone without any problem.

However, there is an issue when i try to sync original apps from itune app store. There is no error message prompt after i sync it. The app just disappear from the application tab.

1) Can I sync and run both cracked and non-cracked on jailbreak iphone?
2) Is there any extra program that i need to install to enable it?

Thanks in advance.

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