Nope--nothing new. I remember a prior boat which had scorch marks at the AC power inlet. When I was on that boat in a boatyard, I recall seeing two power cords that had died that way.
Somebody linked to a solution to this problem, but from the looks of it, they are getting ready to go into production, and don't have parts available or a price just yet. SmartPlug Systems
seems to be trying to fix this. I found the direct link more useful than the boat show video somebody else pointed to on Mad Mariner. If this becomes common, I'll be happy...except for having to buy new cords and re-do the connection on my boat.