Floating Social: not appearing in Headway theme

For some reason I can't understand, the plugin doesn't appear when using Headway theme 3.1.2

Even the html doesn't contain any reference to the plugin.

With Twenty Eleven the plugin appears, so I'm quite sure the conflict is with Headway theme.

I've tried to use the Attempt to fix front page conflicts option, with either the default hook and other Headway hooks, but still nothing appears.

Here's the link: http://dev.tamtando.com

Thanks.