Pandaroo Hello, We use Spine for our game made in Unity. I've encountered a curious behavior in the transition between the moving state and Idle state for a character. It seems to be the IK keys the problem because I animated with IK for the Idle animation but in FK for the Walk and Run animation. At first, the interpolation is fine but after un little time something "break" and the interpolation is all wrong with the legs making 360° during the transition. I've made a little video to show you this weird behavior. It could be fixed by setting Auto Reset in Mecanim Translator to true but the transition becomes then really rough.
Harald Sorry for the late reply, I have been off for Christmas holidays. Most likely you might want to enable Auto Reset and add additional keys at the first frame as described in the spine-unity documentation here: spine-unity Runtime Documentation: Required Additional Keys Unfortunately, transitions in SkeletonMecanim require a bit of additional work compared to SkeletonAnimation. In general when having any problems, please be sure to have a look at the spine-unity documentation as well, as it may already provide answers.
