Minecraft wiki entry for Pretty_Scary_Update, associated text: Mojang then found yet another bug, and fixed "a severe memory leak in the server". This, as well as correct rendering of fences and cobblestone stairs, came in the 1.4.2 Prerelease, released on October 24, 2012.[6] 1.4.2 was the first official release of 1.4, available through the launcher on October 25, 2012.