Minecraft Forums

I'm playing on a downloaded single player world. (I've had this world for quite a while it's nothing new) All of a sudden today things have started to get really weird. In one area there was a square chunk of land missing all the way down to bedrock it seemed. (The size was 16x16 blocks) A little while later (a few hours) many chunks of land aren't loading or are taking quite a while to load. If I look at the sides of the loaded chunks bordering the non-loaded chunks all I see is just black. Pressure plates as well as chat are extremely delayed. Is there something wrong with my laptop? Is it Minecraft itself? Am I getting hacked? This all started today. Every day before this this world loaded just fine. Another problem is that when I try to enter it it doesn't open. After a few attempts I get in but that's when the above mentioned problems start. Is there any way to fix this without losing my world?