Question: Lock Onboard camera not working anymore. Fix?

For some reason this option is not working today: the horizon is moving too much and it used to be solid. All I did was change from practice to hotlap and back. ???

I have checked the Video View option:
Tick the option in the view tab for 'Lock onboard camera to horizon'.

What file is this control stored in so I can go check that its getting set?
 
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