Virtual camera position not getting updated from the inspector after assigning Follow and Look At target.

Steps to repro:
1. Open attached project.
2. Create an empty game object.
3. Click on Cinemachine menu > Create Virtual Camera.
4. Select "CM vcam1" game object in the Hierarchy > Assign Follow and Look At target as the empty game object.
5. Try to update Y position value from the inspector.
6. Observe that value is not getting updated.

NOTE: User can able to update camera position from the scene view.

Reproducible on:
2018.1.0b8, 2018.1.0b7, 2018.1.0b6, 2018.1.0b1, 2018.1.0a7, 2018.1.0a6, 2017.3.0f3.

Environment:
Occurring on both Windows & MAC.