Minecraft 1.5.2 Version Page

Version 1.5.2 is often remembered for being a "crossroads" in Minecraft's technical history:

The stability of the 1.5.2 version made it a favorite for multiplayer servers. The update resolved several frustrating bugs that plagued earlier iterations: 1. Sound and Mob Fixes Minecraft 1.5.2 Version

Resolved a bug that caused tamed wolves and cats to randomly despawn from the world. Version 1

Because 1.5.2 was so stable, modders built frameworks (Forge for 1.5.2) that rarely crashed. Players didn't have to choose between "Vanilla Redstone" and "Modded Machines"—the hopper and comparator allowed hybrid builds that bridged both worlds. Minecraft 1.5.2 Version