MSAA disabled when toggling VRSettings

I'm trying to be able to leave and enter VR at runtime. I've noticed if I set VRsettings.enabled = true and then back to false MSAA is no longer applied.

I've also noticed odd behavior from ImageEffects when entering and then exiting VR. It results in a camera flip.

Is something irreversible happening when toggling VRsettings true and then false?

MSAA looks fine at startup and when in VR:

MSAA after VRSettings = false:

I'm on Unity 5.6.0f3 and my scene is nothing more than a camera, the cube and plane, and a script to toggle VR:

 void Update () {
     if(Input.GetKeyDown(KeyCode.V)){
         enabled = !enabled;
         Debug.Log("toggling VR to " + enabled);
         VRSettings.enabled = enabled;
     }     }