On Safari and Chrome on Mac OS X, the site icon is an empty balloon - the letters 'EC' are not visible. When disabling a CSS rule, the bug disappears:
CSS rule disabled:
Clearing the browser cache didn't solve the problem. As a heavy Mac user, I didn't realize this bug until I checked the site with Internet Explorer on Windows ...
A few months later, the problem seems to be solved for the main site, but not for the meta site: