August 29, 2012 Patch
From the Portal Wiki
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Source: Steam User Forums
Patch notes
Patch 1
Portal 2
No patch notes
Undocumented changes
- Added features to help diagnose issues when playing Co-op quickplay with friends.
Patch 2
Portal 2
No patch notes
Undocumented changes
- Added additional features to help diagnose issues when playing Co-op quickplay with friends.