I share the pain of this post - except my run-in with 1.12 occurred with Docker for Windows. The shared volumes and host networking were totally nondeterministic. I don't think I had really ever experienced software which seemed to fail so randomly.

On the other hand I think Docker can probably be forgiven for my particular frustration. For one, the software was in beta. And two, working with Windows and all the different flavors must be a nightmare.