Matti Airas - I feel a bit dumb, but how on ear...

I feel a bit dumb, but how on earth can I get Freeboard-SK to receive data from the SK server? I can see the default OpenSeaMap just fine, but no vessel data is shown. Checking with the Chrome dev tools, the app accesses a bunch of resources just fine and even opens the websocket stream, continuously receiving a ton of data, but nothing is displayed.