Hi Saskin,
It is not working correctly, but I found a workaround.
Basically, if I disable the Site Title AND the Site Description, then the logo also disappears.
I was only able to display the logo by leaving either the Title or Description enabled. I then set the enabled field (in this case Site Description) to empty under WP > General Settings. This meant that I could display the logo, without displaying the Site Description.
Chris