Updates to Counter-Strike: Source, Team Fortress 2 and Day of Defeat: Source have been released.
The updates will be applied automatically when your Steam client is restarted. The major changes include:
Source Engine Changes (CS:S, DoD:S, TF2)
   - The mat_hdr_level, r_rootlod, and r_waterforceexpensive settings are now saved in the user’s config file.
 
- Fixed clients being able to connect to servers with spoofed SteamIDs.
 
- Fixed a bug where some video configurations could get reset by restarting the engine.
 
- Fixed materials compiled into a map not being loaded correctly if they're in the root materials folder.
 
- Fixed a case of uneven performance on multicore machines.
 
- Fixed point contents not respecting detail brushes. This fixes a bullet penetration bug in some community maps.
 
- Fixed clients being able to spam servers using the ai_set_move_height_epsilon, mission_show, and sv_querycache_stats commands.
 
- Audio fixes:
 - Reduced overlap in the sound timing code.
 
- Fixed a case where audio could skip.
 
- Fixed voice communication getting corrupted while playing on a Mac.
 
 
- sv_pure 2 now protects the game_sounds files in the scripts directory.
Counter-Strike Source
   - Fixed prediction errors that were causing greater weapon inaccuracy (bullet spread) on client than server.
 
- Made the bomb the primary target of a +USE command. This fixes a problem with objects placed around the bombsite interrupting defuse attempts.
 
- Fixed the ‘skating’ behavior that could occur when a bomb planting attempt was aborted. Also fixes the resulting out of sync hit boxes.
 
- Fixed bug in which a player who crouched rapidly and repeatedly was seen as stationery by other players.
 
- Fixed problem in which the sound of a reload that was occurring when a player was killed persisted into spectator mode, making it sound like a reload was taking place near the spectated player.
 
- Gave chat interface priority over scoreboard to reduce conflict between the two.
 
- Increased size of HUD icons.
 
- Fixed bug with env_hudhint that caused problems when its value was greater than 255 characters.
 
- Made the message of the day screen dismissible by hitting ENTER.
 
- Fixed servers not being able to set sv_hudhint_sound.
 
- Gun sounds now match up with the framerate dependent sound timing, and fixed the framerate dependent jittering bugs.
 
- Stats:
 - Fixed an issue that could cause loss of player stats if network connectivity was lost briefly, just after launching the game.
 
- Fixed an issue that caused the favorite weapon to display incorrectly on the stats summary page when a player achieves the most kills with a knife or grenade.
 
- Made newly-earned achievements and stats immediately update in the achievements and stats panels instead of showing stale data.
 
- Improved the font on the achievement toast.
 
 
- Community Requests:
 - Added cvar sv_enablebunnyhopping, defaulted to 0. ( A value of 1 autotags the server with "bunnyhop" )
 
- De_dust and De_dust2 updated.
 
 - Fixed several exploits.
 
- Fixed collisions on crenellation and domes.
 
- Fixed minor visual glitches.
 
- Adjusted HDR settings.
 
- Removed dust clouds.
 
 
- Added console variable cl_hudhint_sound.
Team Fortress 2- Added server ConVar "sv_max_usercmd_future_ticks" which prevents clients from running usercmds too far in the future.
 
- Added missing Mac intro movie for cp_coldfront.
 
- Fixed "Hit '%disguiseteam%' to Toggle Team" string and code so they're not hard coded to 'e' and '-'.
 
- Fixed servers trying to validate backpack positions in inventories.
 
- Fixed clients validating inventories other than their own.
 
- Fixed item selection HUD elements showing un-acknowledged items, which resulted in items in invalid backpack positions.
 
- Fixed players not always getting "recent damager" credit for player suicides.
 
- Fixed the weapon selection menu not displaying properly when using hud_fastswitch and lastinv at the same time.
 
- Updated Engineer startup music.
 
- Updated localization files.
 
- Updated Pl_ThunderMountain
 - o Clipped off sticky outcrops for smoother movement
 
- Clipped various exploit ledges
 
- Increased environment ambient exterior light level
 
- Stage 1
 - Fixed hole in respawn room brushes in RED spawn
 
- Shifted respawn times to favor BLU by two seconds
 
 
- Stage 3
 - Clipped rocks off by BLU's spawn exit that leads to building B (allowed Snipers to snipe the entire area)
 
- Removed embedded displacement (building B interior roof)
 
- Removed rogue clip brush from building A balcony
 
 
 
- Updated Plr_Hightower
 - Fixed players building in the RED spawn room.
 
- Fixed players building on the back window decks of the barns.
 
- Fixed players getting on the satellite dish platform.
 
- Fixed players building on the elevators.
 
- Reduced the ammo packs in the barns down to small ammo packs.
 
- Increased the hill speed modifier to 1.2 (up from .95)
 
- Fixed explosion particle effects playing in the skybox.
 
- Mine cart "window" collision fixed.
 
- Upped Scout-loop health to large.
 
 
- Updated Pl_Upward
 - Fixed respawnroom entities not reaching the floor of split-level spawns
 
- Fixed griefable fence facing BLU spawn near RED base
 
- Added BLU high flanking route at RED base
 
- Added health & ammo along BLU flanking route at RED base
 
- Sealed BLU base left exit with block bullets brushes
 
- Extended clip between C and BLU spawn to prevent sticky jump spawn camping
 
- Fixed non-clipped non-solid railing in RED base
 
- Fixed kill brush in middle spawn not extending to the ceiling
 
- Put a block bullets brush on grate below middle spawn
 
- Fixed some high micro-ledges accessible to sticky-jumpers
 
 
- Community Request
 - Added "item_pickup" game event for ammo/health packs.