Reproduction steps:
1. Open project attached (or create new one).
2. Create empty GameObject.
3. Create new Timeline for that object.
4. Press Record and move object in scene.
5. Expand object details in Timeline.
6. Select other Timeline or object.
7. Select Timeline with expanded object details.

Expected result: Nothing changes.
Actual result: New messages in console:
Message: Getting control 2's position in a group with only 2 controls when doing Repaint
Error: ArgumentException: Getting control 2's position in a group with only 2 controls when doing Repaint

Reproduced on: 2017.1.0b1