I downloaded Xcode 7.1 from the App Store today after working from 7.1 beta downloads from developer.apple.com and have a new iOS app build to upload. So I did:
Here's the quick solution:
Don't use Xcode beta versions to submit apps for release — it's beta for a reason and shouldn't be used with production code.
Apps that are created using beta versions of Xcode or that are built for beta versions of operating systems will not be accepted on the App Store and Mac App Store. Apps that you submit should be developed using the latest version of Xcode from the Mac App Store and should be built for publicly available versions of iOS, OS X, and watchOS — except when GM seeds are available. When a GM Seed of Xcode becomes available, use it to develop your app for submission. When GM seeds of iOS, OS X, or watchOS become available, build your app for these versions.
↳ https://developer.apple.com/support/pre-release-software/
Same problem here. Downloaded Xcode 7.1 from the App Store and it refuses to upload a new version. Happily Application Loader worked ;) Hopefully this gets fixed quickly.
One possible reason for the issue could be multiple development accounts under one name (personal and company). I've read elsewhere (apple radar) that that caused earlier problems of this kind.