@Erisred thanks for the quick reply! Indeed, I want to create a new vault, not open one.
Unfortunately that’s the window that doesn’t render. I haven’t activated any custom CSS or changed any settings.
Though I can’t see anything, by clicking around the “ghost window” I found that I can click the 3 buttons and the dropdown languages menu. The dropdown menu opens up, and the Open button opens a system file explorer (Nautilus on Ubuntu), but unfortunately the Create button leads me to another ghost window, so I can’t quite hack my way around it : /
EDIT:
I found a hack… If I click the Open button (or rather, where the button should be in the ghost window, because I can’t see it), I can “Open folder as vault”, essentially creating a vault in the process. However, if I want to open that vault again in the future I need to go through the same process of finding the ghost “Open folder as vault” button : /