I'm seeing (or, not seeing, hue) the youtube stuff too; looking at how the youtube thing works, it looks like it's trying to load a flash object from youtube. Google did announce recently they were going to deprecate Flash completely though, so, I'm going to try and update the youtube bbcode to use the official embedding method (via an iframe).
edit: this version should work faster, too; after a chrome update some time ago, all Flash embeds (which is what the old youtube tag did - I'm sorry - needed a separate 'play' button in order to activate. This one uses whatever youtube is giving us, so, html5 video embeds if / when available.
@Airling, I'm not sure why the post font thing isn't working for you, er. Maybe someone else that has a clue could look into that?