On Wed, May 17, 2017 at 7:45 PM Christian Schaller <cschalle@redhat.com> wrote:
Just noticed that with the current F26 background image the Fedora logo is invisible since we use the white Fedora logo and the bottom right corner of the background image is also white. 

That's a known issue:

I'll update the extension setting when the design team provides me with a dark variant of the text-only logo (or asks for a switch to the logo-text variant of course)