I noticed this on Firefox. There’s also a warning padlock that says ‘Parts of this page are not secure (such as images)’. I’m guessing the logo uses http so that’s why the image is not rendered. When changed to https, the logo appears.
Thank you for reporting this! For some odd reason some logo/icons started delivering over http (instead of https) after a recent update which caused some browsers to block them.
Should be good now. If you still have the problem, you might need to hard refresh your browser to clear any cached content.