An update has been published for all users. This brings the multiplayer base in-sync with TF2 as of September 30th.

General:

• Client/server memory improvements
  
• Fixed a client crash when switching between windowed-mode and fullscreen for Mac OS X and Linux clients
  
• Added experimental cpu_frequency_monitoring convar to detect thermal throttling. If you have performance problems on Windows, add "+cpu_frequency_monitoring 2" to the command line to see if CPU thermal throttling is an issue. If the displayed CPU frequency percentage drops below about 80-85% then you may have a problem with your CPU slowing down due to overheating. If it drops below 50-55% then you may have a serious problem. CPU overheating can be caused by overclocking, insufficient cooling, insufficient airflow, failing or dirty fans, or other causes. For more detail see https://support.steampowered.com/kb_article.php?ref=2715-YIPD-6873

Virtual Reality:

• Fixed selecting the wrong refresh rate when running on a display that does not use the desktop refresh rate

The previous beta update has been published for all users.

NOTICE: This update includes a mod compatibility breaking change for multiplayer mods. See this discussion thread for details.

General:

• Upgraded Steamworks SDK to v1.29
  
• Fixed mod compatibility problem with Multiplayer Base that was introduced in September.
  
• In Hammer, while using the Vertex Tool, pressing CTRL+B will snap selected vertices to the grid.

Virtual Reality:

• Mods that support virtual reality now need to have a line in gameinfo.txt that says “supportsvr 1”. This indicates to gameui and engine that certain UI should be enabled.
  
• VR-enabled mods will now start up in VR mode when launched from Steam’s VR mode.

Windows:

• Upgraded to Visual Studio 2013. If you need to build projects for VS 2010, add /2010 to your VPC command line.

OSX:

• Upgraded to XCode 5.

NOTICE: This beta update includes a mod compatibility breaking change for multiplayer mods. See this discussion thread for details.

General:

• Upgraded Steamworks SDK to v1.29
  
• Fixed mod compatibility problem with Multiplayer Base that was introduced in September.
  
• In Hammer, while using the Vertex Tool, pressing CTRL+B will snap selected vertices to the grid.

Virtual Reality:

• Mods that support virtual reality now need to have a line in gameinfo.txt that says “supportsvr 1”. This indicates to gameui and engine that certain UI should be enabled.
  
• VR-enabled mods will now start up in VR mode when launched from Steam’s VR mode.

Windows:

• Upgraded to Visual Studio 2013. If you need to build projects for VS 2010, add /2010 to your VPC command line.

OSX:

• Upgraded to XCode 5.

The Upcoming beta in the Base apps for Source SDK 2013 have been updated with the latest code from TF2 and HL2:

• Adds support for Visual Studio 2012 and 2013
  
• VR Mode:
  
  • Switches from headtrack.dll to sourcevr.dll
    
  • Improved readability of the UI in VR
    
  • Removed the IPD calibration tool. TF2 will now obey the Oculus configuration file. Use the Oculus calibration tool in your SDK or install and run "OpenVR" under Tools in Steam to calibrate your IPD.
    
  • Added dropdown to enable VR mode in the Video options. Removed the -vr command line option.
    
  • Added the ability to switch in and out of VR mode without quitting the game
    
  • By default VR mode will run full screen. To switch back to a borderless window set the vr_force_windowed convar.
    
  • Added support for VR mode on Linux
• Many assorted bug fixes and other changes from Team Fortress in various shared files

The Github repository for Source SDK 2013 now has the matching code changes.

This beta breaks mod compatibility for VR mode because of the extent of the changes. If you support VR in your app you will need to update to the latest source.

We have released an update for the Single Player piece of the Source SDK. Changes in this update are:

• Fixed hammer not loading materials correctly
  
• Fixed hammer to correctly populate the available mods list when first launched.
  
• Added "(Steam) Load Module" option to hlfaceposer so you can load models from vpk files
  
• Fixed crash on save when using the particle editor
  
• Added maya plugins for SDK