David_kay ha scritto whenever I make a new keyframe and change a position it almost never registers the change properly and the animation just snaps from one position to the next. Also, whenever I make a new keyframe in the middle, it completely utterly destroys the pose in the next keyframe.
Wild guess...: you may not have keyed in both frame 0 and the last.
Also, 'AutoKey' doesn't comes enabled with a fresh installation of Spine. Either make sure you manually key in (commit) every change or enable AutoKey. Otherwise you'll make changes but not saving them when moving to another frame.
My advice is that you select ALL bones (and even meshes) and manually key in rotation, translate and scale at frame 0. And if you're making a loop (like a walk cycle) copy all of them to the last frame (they should be the same in loops). That way, every change you make in between is gonna get interpolated as you are expecting and it will not snap.
Mind that presetting all keys is considered bad practice because of the huge number of unneeded keys you'll be setting at the extreme frames. But as of version 3.5 we have a little button 'Clean Up' that automagically erase them. Just be sure to use it only when you're done with that animation setup.
Edit: It's best that you don't "highjack" old threads to post your own issues. Just create a new one and that way you'll get quicker answers. I only found your post by chance...