Hi,
I have updated to the newest runtime because spine auto updated and my skeleton would no longer render correctly. Now when I use skeletion.flipX = true, the skeleton is flipped, but it renders in the wrong position.
It appears to render at a position that is (0 - worldX). When flipX is false, it renders in the correct world position again. For example as I move in the world from (0,0) to (0,100) with flipX = false, it renders correctly. When I flip X, the animation renders at (0,-100). This is obviously very problematic! :S
One other minor suggestion. Could you expose the BasicEffect in SkeletonRenderer? (I have to make it public each time I update to the newest runtime) I manage the world matrix on the effect.