Just had this reply from Paul
Hi Mal
It is a dns issue this time. It has been fixed, but you won't see the map tiles until your ISP has updated its DNS cache, which can take 48 hours but is usually much faster. I think the tiles are already back up for most.
Worth noting that the route maps will still be up, if you are logged in.
Sorry about this
Paul
They're on it so it should soon sort itself. Quick service as always!