A Steam client update is now available. To apply the update, click the File menu inside of Steam and then select "Check for Steam Client Updates...". The specific changes include:
Fixed an issue on Windows 2000 requiring the SP4 update rollup 1 package to be installed for Steam to run
Fixed in-game overlay generating spurious D3D11 debug runtime warnings about CSSetUnorderedAccessViews when running on downlevel hardware
Fix regression causing a crash on exit in the in-game overlay
Small startup performance optimization to not initialize settings dialog data until needed
Fix the you have been logged in elsewhere dialog to not leave Steam in a broken state on Cancel
Support for a forthcoming news URL format change
Fixed Retail not prompting for a CD key when creating a new account
Fixed VGUI crashing when the number of panels was very large (ie, for users with huge friends/clan membership lists)
Decreased number of VGUI panels active at once for friends list
Decreased the time it takes Steam to launch some games
Fixed memory leak when resizing in-game overlay web browser
Fixed potential failure or client hang when failing talking to content server directory servers
Fixed overlapping text for pending group invites in the friends list invites section
Fixed error message “You don't currently have any games ready to backup..” when restoring a previous game backup
Fixed Cloud changing last modified times on clouded files.
Fixed the Cloud sync transfer rate display in list view
Steamworks - Fixed case where building an installer could randomly fail due to an error in the Microsoft crypto library