Experiencing some mesh distortion using IK in the spine-c runtime. Not sure if it's a spine runtime bug or if we're doing something silly in the editor. I've uploaded the files so you can check it out. Hopefully it's just a rounding error like before. 
(It's the big brown finger / nail.)
Spine files:
http://forceofhab.it/_files/temp/fingerOfGod.zip
Distortion image: Image removed due to the lack of support for HTTPS. | Show Anyway
I've made Nate aware of this thread now, thanks for the heads up and the project.
Ahoy, I know this is one hell of a necro, but this problem still persists. We haven't changed the file much since the last post, so the above file is still good. Here's what it looks like in the spine editor for reference.
A distinct lack of kink in the finger 
cheers!
Is it not just a problem with your inheritance of the ik's all of them are parented under another one.
I Took a quick look, I think, currently you only need to move the knuckle down if you want a press motion. I couldnt see any mesh errors in editor, and I don't have the time to test it in our implementation of C runtime (sorry)
The issue just looks the vertex ordering is messing up in the animation, and one face is over lapping the other? Try rearranging the vertex?
