Stuck in Dark Mode

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I can't deactivate the dark theme in the system preferences. It just stays in dark mode, even after restart.
I had flux installed, which turned on dark mode automatically at night, but I uninstalled the app. I ran Onyx hoping to delete any cache files causing this, but no luck.
I opened a thread on the flux forum, but haven't heard back...

Any ideas?

 

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This helped: https://discussions.apple.com/thread/7058719?start=0&tstart=0

I deleted the ByHost folder in /Library/Preferences. Now it works.