Nope, they and the rest of my birds are fine. I have 2 blue Ameraucana's from the same hatch (Easter) that are fine. It only affected the 2 black Ameraucana's. Could be coincidence, but it's strange. Both started with a crop that wasn't emptying, then moved to sour crop. In fact, my pullet didn't look so lean because her crop was so large, it made her look like a healthy weight. It wasn't until I picked her up that I noticed that she was not fine. No free range, no change in feed. I have been supplementing the Bob's stuff in their water, but I wouldn't think that would cause an issue.
I also have 2 hatchery chicks that are younger than the U of A's and they are fine too.