Several times I've started a new game. Played several times. Then suddenly I goto continue a saved game and I'm going through the beginning process all over again. I can get back to where I had layed a land claim block (which doesn't show on map or compass. All saved points are gone). All the items I've placed are there. But the land claim.block shows jammed. All storage chests show jammed. I can use things like forges and workbenches but the game no longer sees me as the owner. I can't destroy or place anything within the claim area. So I'm left with deleting the world and generating a new one.