I started having the “Ready to Fly” button not appearing about 2 weeks ago. In my case I also found that my vram usage was at/over 100% (12GB with a rtx 3080 ti). Fixing my vram saturation problem solved this issue completely. Clearing all the nvidia caches, as shown here, and switching to DX11 solved my vram usage problems. In its current state, using DX12 beta increases my vram use by 50%!
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