Help App update failing to install

For some reason my iPad 2 iOS 7.0.3 (11B511) is having problems with the latest update to the Twitter App, taking it to version 5.12. Whatever I do the App running on iPad continues to operate Twitter version 5.11.1

The update to 5.12 does appear. I click to download, it appears to download but it fails to install. There is no error message to give a clue to the cause of this problem.

iPad has 8GB of available space. This is what I have tried so far ... None of which have solved the problem.

1. Completely closing the Twitter App and the App Store. Deleting the Twitter App, re-booting iPad and then reinstall from the App Store App, which displays under Purchased Apps, Twitter v 5.12. Despite this it installs v 5.11 then offers the update, which appears to go through the motions of downloading and installing, but when I check the App it is still operating v5.11 as the enhancements included in v 5.12 are not there.

2. Checking the App Store App updates Tab shows Twitter v5.12 with an option to Open. Once again this only opens v5.11

3. I have tried deleting my Twitter Account and repeating this process, all to no avail.

4. I have also tried deleting the Twitter App from iPad, which should remove all of its data in theory. Then going to iTunes on my PC, and downloading version 5.12. Then syncing iPad with iTunes and installing Twitter from there, but it still stubbornly insists on running the previous version.

This is very frustrating ... I also have an iPhone, running iOS 7.0.3 (11B511) Twitter version 5.12 has installed on that with no problems. I particularly like the picture previews which this update to Twitter brings and would love to have this facility on iPad too.

Is there a fix to this problem with the failing update on iPad? Help appreciated.