Every iPhone user has had this experience. You download an app, you open it, you wait….and wait….the screen goes black, and the home page reappears. Apparently, this app crashing phenomenon is the result of problems with the application's embedded DRM.
There are a few tricks that should help resolve this issue:
1. Reboot iPhone
Just like your computer, sometimes you just need a plain ole restart. Shut down your iPhone, wait 30 seconds, and power it back up. You'll be surprised how often this works.
2. Delete and Re-Install
Press and hold on the application, and tap the "X" to delete it. Connect your iPhone to iTunes, and resync to get the application back.
3. Restore your iPhone
NOTE: MAKE SURE YOU DO A BACKUP FIRST. Restoring your iPhone wipes all the data, and then rewrites whatever you backed up. This could take some time. If restoring your iPhone doesn't make the application work, give up and wait for an update with bug fixes.
4. Reduce your Number of Apps
Sometimes your iPhone is just overwhelmed. Go through your device, and get rid of all the junk apps you never use.