Hi,
I have a very interesting, but annoying issue occurring in my animation.
I have two translate keys set on a bone. Half way between them the bone suddenly jumps to the end key position and stays there. There is no physical key there and in the Transform dialogue, the translate key is orange.
I have tried setting a new key at that point but it still jumps.
I have tried restarting Spine. I have tried deleting all the keys and re-setting them. No change.
Strange. Is there a curve in the Graph view? Your screenshot shows the translation key as yellow, did you make a change? If you ever see a key button yellow when you didn't make a change, it's bad
please send us the .spine file and tell us how to see it happen. contact@esotericsoftware.com
We have had this before too. although we did rectify it I am not sure how, I will ask the artist next time he is in the office 
I'm experiencing this same issue where the translation jumps where there's no keyframe. I've tried the usual shut down and re-opening the program. I also tried copying a previous keyframe and pasting it to a part of the timeline after the jump, but that didn't work either. I also tried to create a keyframe after the jump and modified the position of the translate and it just pops back to the jumped position.
-BinaryCats, you mentioned that you experienced this issue and somehow resolved it. Did you ever get a chance to find out what the resolution or work around is?
Please send a project (no images) and instructions to see the problem: contact@esotericsoftware.com
Totally forgot I posted this.
I had to delete the animation entirely and start from scratch.
