Hi !
I don't know if it's a Graffito bug or Gantry, but I post it here. I want to show an ad block only on desktops. So I used the visible-desktop class suffix to that block. But looking at my site, the block is hidden on my laptop. I looked at the CSS with Chrome's Inspector and here's what I found:
.visible-desktop is by default set to display:none and is set to be visible only between 960px ans 1199px@media only screen and (max-width: 1199px) and (min-width: 960px)
.visible-desktop {
display: inherit !important;
}
Having a screen resolution of 1600, this explains why it is hidden when having my browser's window maximized... I have installed the latest update of Gantry, but it doesn't solve this.
Of course, I have changed it through my template-custom.less file, but I tell you about this bug so you can add it to the next update 
Thanks