Missing Icon (Found reason)

Hi, I am really enjoying Opigno these days. It is not easy, but is worth the effort. I have been installing some extra modules. One of them is admin_toolbar. I have noted that once I install admin_toolbar, the Messages icon in the main user menu disappears. I do not know what causes it. Obviously, our great friends in Switzerland have much more important things to do than solve a little thing like this, so, I am only posting this as a warning to those who might think of installing admin_toolbar. I wish everyone the best, Tim