I got this particular update to post , I messed around with the version/build numbers and away it went eventually after 4 days of trying. It seems like I had to bump up both the version and the build number to get it to work?! But now I have hit the problem again. So I feel my understanding of the rules around version/build numbers must be faulty. Is it possible that once a version is sent into Production that you may not use that version anymore?

I saw it here, and it disappeared after I agreed. https://developer.apple.com/account