On leaving the (Voruna) Leverian and the store page that opens after, my screen was black but Nora's subtitles were visible.
When I used the pause menu to go to navigation, I could see some of my Warframe.
After coming out of navigation almost everything was greyscale.
Images here because I can't get them to insert.
It went back to normal when I went to a relay then back to Orbiter