i had the same problem. I just installed the latest verson of adobe after effects CC and my DXV3 codec had gone. I tried reinstalling the codec but that didn't work so i had to go back to the previous after effects version (15.0.1) so i could use the codec again.
I'd really like to keep updating my after effects since i'm paying monthly for it, and i want to be able to use any new features they bring in. I know Joris has mentioned they're working on it... Maybe we need a little program we can re-render our files through to use the codec but without losing image quality. Is that possible?
I also saw some people were talking on the forum about apple phasing out Quicktime.
Should we be saving our files as a different file type? If so what's the best one to use for animations? AVI?