I'm beginning to suspect my cable.
If I try to respawn or restart a mission or select role again I go blue screen headset. Steam VR and DCS still running?
Deleting my saved games folder solved the rearm window issue.
My issue is that upon second single player mission loading or re-spawning in multiplayer, once the mission loads my g2 goes Blue yet steam VR on desktop is still running DCS and is ready to fly.