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Check that you have the latest version of the iPod Touch software. The latest version of your software fixes any bugs that prevent apps from opening or spontaneously closing. If you have the 3.0 software, very few apps still are not capable for that software, and will never stop closing out. If you have the iOS4, then check to see that the app works with iOS4. Most apps should have been updated within the couple weeks of the release of the iPhone 4. Also, try redownloading the apps, which may help.
First of all, do you have Java installed? Second, if you do have Java installed, then did you incorrectly apply a mod or texture pack? One thing you can do to stop this is deleting, and reinstalling Minecraft. Before you do this, be sure to get a copy of your save files.
that sounds like a big problem, i would try reinstalling your game, and checking if your computer meets the system requirements for the game to work properly.
You need to go into a wifi area and then it will stop waiting and start loading. Then you have the app you purchased and may delete it if you want.