Bitwarden becomes invisible

Hello. I did nothing special (no upgrade, nothing), but after restarting my PC (using Brave browser), when I open Bitwarden to type the password, I can’t see a thing, it remains entirely blank, and nothing happens either if I type the pwd without seeing what I do. So the whole thing is completely useless now. Any suggestion (accessible to a non-technically proficient person) ? Thanks in advance.