I used this link to install CU1 to the client:
http://myitforum.com/myitforumwp/2012/08/23/managing-configmgr-client-patching-using-the-new-cumulative-updates-servicing-model-and-adr/
SCUP infrastructure should be configured properly (GPO for domain clients, local policies for workgroup clients, certificates).
Keep in mind Microsoft specifically says the CU should be install if you are experiencing the issues described in KB.
Regards,
Alex Ignatenko | MCITP:Lync 2010, Messaging, Server 2008 | MCTS:UC Voice, Virtualisation, SCCM, SCOM, OCS | MCSE: Security