Cannot select chacter

When I try to select a character, nothing happens. I’m stuck with my current character.
BTW, I checked out the YouTube video “CA
Borderlands 3 - How To Fix Broken Character Select Screen and Cutscenes on PC!” by TechHow and did everything he said. No effect.
I’m using a CorsairOne i64, with Windows 10 64 bit.
Thanks very much to anyone who can help!