This build HAS finished processing, BUT it is now stuck as a "grayed-out" build. I have never seen anything like this before. Is this a brand new problem on iTunes Connect?
totally bizarre...
An update from us, due to
(i) adding a new build ("451") which is pointlessly identical other than the build number
(ii) waiting 2.5 hours
seemed to do the trick. Interestingly it just skipped or got confused about 450, so maybe there was some problem there.