Age of Empires 2: Age of Kings Patch

If you are playing a multiplayer game, all players must be using the same version of Age of Empires II: The Age of Kings. For example, you cannot play a multiplayer game between Age of Kings 2.0 and Age of Kings 2.0a.

• Stability Improvements - A number of crashes and multiplayer out of sync bugs have been fixed, resulting in improved game stability.
• Computer Player Resigning Bug - The computer player will no longer resign after a few minutes of play. (Previously available in the AI Update.)
• Fish Trap Bug - You can no longer build a Fish Trap on top of an existing fish resource.
• Fishing Ship Bug - You can no longer use a Fishing Ship to construct buildings other than a Fish Trap.
• Flare and Waypoint Bug - The game no longer crashes when you set a flare or waypoint location at the very Southern-most point on the map.
• Cooperative Farming Bug - When you take over a Farm foundation built by an ally, you can no longer extract more than the standard amount of food from that Farm.
• Farming on Forest Bug - You can no longer build a Farm or Wall on top of a partially cut section of forest.
• Unit Ignoring Orders Bug - Units no longer ignore orders under some circumstances.
• Multiplayer Restore From Zone Bug - The ability to save and restore a disconnected or out of sync multiplayer game on the Zone has been improved.
• Foundation Outline Bug - Building foundations now have outlines, so you can now click on them when they are behind trees or other objects.
• Trebuchet Firing Bug - Trebuchets no longer miss targets that are on a different elevation.
• Single-Player Campaign After Regicide Bug - A single-player game will no longer automatically end immediately after a multiplayer game of Regicide was played.
• Computer Player Bugs - The behavior of the computer player in multiplayer games has been improved.
• Scenario Editor Bugs - A number of Scenario Editor bugs have been fixed.

More details here.