If moving the camera (as opposed to the object) on a 3D layer and creating key-frames in the timeline, the camera only moves on playback after clicking on a separate layer outside of the 3D layer (e.g. a 2D layer).
If dragging the play-head along the timeline, the camera movement jerks to the new position when the play-head is released. Again clicking on a separate 2D layer resolves this.
Tested this in 3 versions and this behaviour is the same in CC2017 and CC2015.5.1 but CS6 appears to work as expected where the camera moves smoothly without having to click on a 2D layer.
System - Windows 10