A minor update has been released for the Steam Client and will be automatically downloaded. 
In addition to all the features of the May 21 update, this update includes:
In-Home Streaming- Improved visual stuttering/out-of-order video frames on certain hardware
 Fixed a cause of all-black video streams related to specific Wi-Fi routers
 
Find out more about the new In-Home Streaming feature at 
http://steampowered.com/streamingGeneral- Fixed some reported crashes in the Steam client
 
 Improved compatibility with old CPUs that do not support SSE2 (Windows only)
 
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