OK, When I got on yesterday I found that I can't get my watermelons or my pumpkins because it says "You don't have permission in this area" So I thought "Ohh ok I have lot's O food so I didn't mind. Then when I came on today I found that I can't open my chests... I mean all of them and can't get supplies,blocks,etc. So I need help getting the land that was mine back.

File a PE from the location so that a mod can look into the issue in-game.