9 June 2009 game engine update glitch

The 9th Juen Glitch happened on the 9th June at around 16:00 BST after RuneScape was updated for the "Rest" button. Jagex also made significant changes to Agility, and the way run energy is calculated.

After the update happened, and people were getting back to what they were doing, many different glitches started to happen. One of the major ones was that NPCs wouldn't retaliate if hit. This led to people soloing the Corporal Beast, and going through the Fight Caves extremely quickly, as they had no worry about dieing. This also led to many expensive drops from monsters like the Corporal Beast being given way. After this, Jagex tried to fix the glitch, but many others kept happening. After a third system update, it seems most of the game is back to how it should be.