I stumbled upon a bug with paths. I have three coins following a circular path. I didn't want to have constant speed to I unchecked the option in the editor. After displaying the animation in the browser I noticed that the coins didn't move. Checking "Constant speed" helps. Am I doing something wrong in the editor?
Here is an example using the official spine-widget runtime:
http://3.live-preview.com/spine_path/
And a zip with all spine files:
http://3.live-preview.com/spine_path/money.zip