Player Settings are "Locked"

Hi All,
For some unknown reason, recently I’ve not been able to change any of the Resolution, Default is Full Screen, or Display Res Dialog settings. When I try to change them, they revert back to their original setting immediately. In the e.g. below, I select Enabled, and then it just defaults back to “hidden by default”. The same thing happens with the Default screen width or height, it just bounces back to the default I have there.

I’ve tried deleting Buildplayer.prefs and EditorUserBuildSettings.asset, but this doesn’t have any effect.

Any ideas what could be causing this? I haven’t changed any other settings in the project so am a bit perplexed :s

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Argh sorry guys - silly mistake on my end. Just figured out it was the Oculus rift plugin that was causing the problem. As soon as I deleted it out, I was able to change the settings again.