I just encountered a brig in hourglass that had gotten shallow enough at Kraken's fall that it couldn't be sunk. It was 100% full of water, to the point where the deck itself was wavy, but it still wouldn't go down.
One of the people on the ship was quite proud of himself, and how it wasn't bannable because Rare said they were trying to fix it, but wouldn't ban for exploiting it in the meantime.
It would help to have clear guidance on what is and isn't acceptable. I get not wanting to ban people who are screwing around with goofy behavior, but in this case it's quite deliberate, done with the understanding that it's acceptable behavior, and quite game breaking.
I got some of it recorded, and will make a report, but I'm not sure if I'll play hourglass until this is resolved.