The issue was caused by the changed defaults from the Cycles side. Because of those properties being saved as an IDProp and not being saved to the file, every change to the defaults would ruin someone's day updating the values. Added a bpy.app.handler.version_update which is run after the regular do_versions() are done and could be sued by the scripts to apply versioning code on their settings. Reviewers: campbellbarton Reviewed By: campbellbarton Differential Revision: https://developer.blender.org/D761