Hi,
just encountered the following bug after updating (hadn't updated for a few days). When saving a project after removing the Constant speed Check of a path, the project will be corrupted.

I was able to easily reproduce the bug:

Step 1: New Project
Step 2: Add a path
Step 3: Add a new bone and add a path constraint targeting the new path
Step 4: Remove the Constant speed check.
Step 5: Save the project, close spine and try to load the project.

Hope this helps