I've just updated my iPhone to iOS 5.0.1 and tried to reinstall pkgBackup (which was working before the update). Although Cydia says the app is v5.0.8, the one that runs is 4.0.5c which doesn't support Dropbox ... so I can't restore my backup. Help!! 
I've tried deleting the app and reinstalling it. Tried rebooting the phone. Always the same.
I've tried deleting the app and reinstalling it. Tried rebooting the phone. Always the same.