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The payment info is stored in device, it can't be delete even you delete the app, I guess that you forgot to backup your data before update OS,  after upgrade to iOS 5, your payment info lost, so it ask you for payment again, I suggest you contact Apple for help
Then find the audio (title prefix "[audio]") and share it in iTunes, then you can copy  to your computer
Click top left "+" button, check out FAQs 
Quit and Close MediaBurner and launch it again after 2 hours, it will be fixed. Im sure.
Here is the home to fix problem, just post any idea here