I had the same problem because I was applying my rotation matrices out of order. I flip horizontally by doing negative scale on the X axis. Correct order for my framework was finalTransform = translation * rotation * scale, but I had scale and rotation transposed.
My own runtime progress (iOS)
Well, a bunch more stuff working tonight. A few more bugs. Took a super high res video with my good camera but can't find the cable. Will upload that tomorrow. This looks sweet !
If your Mac is fast enough, you can use the built in Quicktime screen recorder. Works okay for me.
Oh thats cool. Never knew it could do that lol
Nice pretty High Resolution video of my iPhone Spine Demo !
Looks very nice! Congrats.
I suggest to start another Kickstarter project, count on me 
Any chance you might want to share working demo with cocos2d community?
renderplace ：Looks very nice! Congrats.
I suggest to start another Kickstarter project, count on me
Any chance you might want to share working demo with cocos2d community?
This isn't using cocos-2D, and I think Nate is doing a specific Cocos-2D runtime, and there is already a 'hacked' version running in another thread I think. I am fairly sure I will release my source when I'm finished. Just not finished !