Oops times two. I guess you don't like ghost ships much.
I deleted an old obsolete folder on the server but the Stena Hollandica ship file still referred to some images in it.
All good now.
And yes. Use https (You will loose all your progress though :-( ). I tried where possible to push everyone onto https but I am having trouble to get the server redirect settings to catch all cases.
If you are technically savy and then you can go into the localStorage of your browser and backup and restore your progress data manually.