Howdy, iphon3r!
A couple of potential resolutions can be found in the following article:
iOS: Troubleshooting applications purchased from the App Store
http://support.apple.com/kb/TS1702
Specifically:
If the issue affects only a single app, try closing just that app:
- Press the Home button to return to the Home screen.
- Double-tap the Home button to display recent apps.
- Tap and hold the affected app until the red minus appears.
- Tap the red minus to quit the app.
- Press the Home button, then restart the app.
Hold the Sleep/Wake button until "slide to power off" appears. Slide to power off your device. When it is off, press the Sleep/Wake button to turn it back on.
If these procedures don't resolve the issue, you might also consider the following (after making sure that you have a current backup of your device):
iOS: Understanding 'Erase All Content and Settings'
http://support.apple.com/kb/HT2110
iTunes: Restoring iOS software
http://support.apple.com/kb/HT1414
All the best,
Allen