Brink on PC has just been updated. The patch notes on Steam are as follows:

General:
• Fixed sound dropping out when playing networked games
• Improved graphical performance, especially when using Ambient Occlusion
• Fixed voice packs being reset to default when you delete another character
• Removed ability to use certain cheat protected commands in challenges
• Fixed memory leak/crash when alt-tabbed out

User Interface:
• Full servers are no longer filtered out of the browser
• Added support for entering a range of numbers (i.e. 10-12) in server filters
• Reduced font size in the server browser
• Exiting Head customization returns to the correct menu
• Fixed being unable to bind KP_Enter in the UI
• Increased font size of in-game text chat
• ‘Enter’ now closes text chat prompt if empty
• Fixed challenge in menu flashing even after completion

Dedicated Servers:
• Improved dedicated server CPU performance
• Fixed NPC not spawning for escort objectives online on servers using unsupported cvars