I'm having a strange issue with Minecraft recently. My friend said that they also experienced it. I'm not sure how to start, so I'll start with how the bug started. I decided that I wanted to generate a new map and build something in a mountain biome. When I spawned, I flew around until I found a mountain, then paused, then changed the render distance to 25. When I unpaused, the chunks on the ground began..glitching? They were like, cycling between random parts of other chunks. So, I paused and quit to the title. The game crashed. I started the game once more, deleted that map. I generated a new one, and it took a really really really long time to get past "Downloading Terrain" When it finally did, the big issue started. The map didn't load, or generate. I was just in an empty void, falling. So I quit, and generated a new map. It crashed at "Downloading Terrain" So, I restarted the game, generated another new map. I was in the void again, but after 50 or so seconds, a few chunks generated. Past that none would generate. The mobs in the chunks didn't move and I couldn't even interact with them. Also, I fell really, really slowly. So, I tried turning on my server and played on my map that had already been working. Everything worked fine with that. Later I tried generating a new map with the server, and I couldn't even join the server. So, I reinstalled all things Minecraft related and tried changing the render distance again. Now. the limit is 16 chunks, but the same thing as before is happening, just now the map will load eventually, just really really really slowly, and mobs wont move while the map generates. I also changed the version to 1.7.10 and the same glitches remained.