Cannot open the manually downloaded apps on my iphone 4 after upgrading it to 4.3.3. Can anyone help?

I have just upgraded my iphone 4 to version 4.3.3. The upgrade was successful but I cannot use anymore those applications (e.g. facebook, google) which I downloaded from the Appstore. I tap on an app, I can see it opens itself but the screen changes to black for a few moments and after that it returns to the homescreen. But when I open the bottom line as i want to see the running apps, it shows that it is running. The applications which were already on the phone when I bought it (e.g. messages, mail, camera, youtube), are working correctly.
I tried to turn it off and on but nothing happens. I'm afraid to reset the phone to the original factory settings because I don't want to loose all my contacts and settings.
Please help me what can I do!

Well, I finally found the solution. I deleted two applications from the phone and downloaded them again from the Appstore, and they worked. But not only these 2, all of them.
I also uploaded some ringtones and syncronized the phone but I don't think these were the solutions.

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