I wanted to get from one play to another by placing multiple nether portals to get there faster. I placed the first portal and went to the nether. Then I traveled some distance and I placed another portal to get back to the regular world. When I went through, I couldn't get back. It is stuck on the loading screen "building terrain." I went out of Minecraft, and when I went back in to the world, it still says "building terrain." My brother also has this problem. I have worked on my world for a long time and now I can't get back on.