From the doityouselfchristmas forum from Jon. "While we always say that you generally cannot revert to an earlier version once opening your profile or sequences on a newer version, there are some points where this is more critical than others. We've recently been working on some effect enhancements that will not be compatible with previous versions. If you're using the development builds, it's important to note these changes. Version 368 that was posted today is the first of several builds that will migrate effects to use the new objects and will break compatibility with older versions. 368 specifically will migrate the pinwheel effect, which is the first effect to get the new curve based enhancements. (more on this in another thread)"