VMware became aware of an issue affecting users of VMware View after applying Update 2 to their ESX 4.0 hosts. The problem only effects PCoIP, RDP works normally. There is a discussion of the problem in the VMware Communities here.
While our IT Teams work to resolve the issue, the Knowledge Base Team has responded by creating an up-to-the-minute live document at: https://kb.vmware.com/kb/1022830 and using @vmwarecares and @vmwarekb Twitter accounts to alert customers.
This Knowledge Base article will be updated as new information becomes available. If you have been affected by this, please read the KB.