This is the latest patch for Titan Quest which adresses various crashes, multiplayer issues, and other fixes.
Titan Quest - v1.15 Patch Notes
Fixed crash issues involving teleporting
Fixed pathing crashes involved with entering and leaving underground areas
Fixed crashes involving the Alt-Tab function
Fixed crash issue which could occur when standing at the same coordinates as an item and attempting to pick it up
Fixed a bug where items would occasionally fall through the world when they are dropped or unsuccessfully picked up
Fixed a bug where storing manual character back-ups in the SaveData folder would cause those characters to not be visible on the character select screen
Improved character auto back-up system
Implemented texture reduction matrix which allows the low graphics settings to use more compressed textures and improves performance on low end systems
Implemented the ability to turn shadows on and off. Shadows are currently on by default.
To turn shadows off, go to the My GamesTitan QuestSettings directory and open the options.txt file after changing any option in game. Find the setting called "Shadows" and change its value to false. If the setting does not exist, add the line "shadows=false" to the end of the options.txt file.
Fixed the 'Fatal Error' message appearing when trying to boot up Titan Quest(tm) with Virtual Memory turned off
Implemented a minidump file into the crash logging system
Fixed bug in quest system where quests updating on certain conditions could cause the game to crash and corrupt quest data
Fixed situation where players were not given credit for quest completion while leaving the game upon completing a quest
Fixed Quest NPC issue where NPC's were not completing their animation cycles and awarding proper quest tokens to advance the quest. This is in reference to issues some players were having with some of the ship captains updating as well as Phaedrus in the Catacombs.
Fixed host quest log from being updated when an ungrouped client enters Titan Quest(tm) with certain quest items in their inventory
Fixed host quest log from being updated when an ungrouped client enters Titan Quest(tm) and proceeds with critical path quests
Improved the thread safety of the quest state saving system
Fixed array values not working properly where importing a record in the Art Manager
Fixed issue where impassible terrain was not viewable on ATI cards
Fixed disconnects and the inability to host a game for certain network devices which were unable to process network packets over 1400 bytes.