Today i was playing on my singleplayer world in minecraft when i turned on the LAN setting. I changed myself to creative mode to fly back to my house, but when i turned myself back to survival, i couldnt place anything down or break any blocks! I have tried redownloading minecraft but that didn't help at all. It is just me on the LAN world so it can't be anyone else. Why is this this and how do i fix it?