ISSUE FOUND
Well Google led me here, having this same problem, and having read these posts I did some more experimenting on my own.
With my testing, the problem surfaces by creating Sprites with the Smooth Moves Atlas Editor. As soon as the sprite is in the scene, I can no longer:
- Change State Names (Hitting enter upon typing in a new name simply reverts it back, no change)
- Add Events (cursor flashes in text box briefly then disappears, no time to type)
- Rename Objects in Hierarchy (same as above)
This specifically only happens when the sprite is Enabled (checkbox) in the Inspector next to its name. I've tried renaming it from Sprite, have tried removing each component to narrow it down, but it's nothing else, just the fact that it's enabled will cause these issues. If multiple sprites are in the scene, they must all be disabled for PlayMaker to work again.
Here's hoping this'll get looked into.