The problem here is an Apple problem, whereby iPads running ios 6.1.3 or Lower can't update apps. iPods, iPhones, and devices on iOS 7 beta 3 can update apps without a problem.
This must be a hit or miss with people running 6.1.3---because I have been able to update my iPad, iPad mini and iPhone without issue.
Skimonkey ~~ sent from my iPad MINI using iPF