Window capture with OBS studio (F35)?

[Lars Kellogg-Stedman]

I'm running Fedora 35 with an Nvidia Q1000 graphics card, using the
Nvidia drivers. I'm use X rather than Wayland:

$ loginctl list-sessions
    SESSION  UID USER SEAT  TTY
          5 1000 lars seat0 tty2

1 sessions listed.
    $ loginctl show-session 5 | grep Type
    Type=x11

I would like to use OBS Studio to produce some videos, but I have been
unable to get the "Window Capture" feature to produce anything but a
black rectangle. I've tried capturing both Chrome and gnome-terminal
windows without success.

I have tried with and without the "Use alpha-less texture format"
checkbox checked.

Has anyone been able to get this to work successfully?