Alls I can say is do that till it happens, maybe something else was going on in background as I was working on the Daggerfall options menu which is shown.
I uploaded my .MagicBox if you want to use it for debugging. it’s the dark setup.
https://drive.google.com/file/d/1EVmhI87i5u3-lRKEA4hVExF6o90a0Sd3/view?usp=drivesdk