I’ve got an environment running vSphere 5.0 and VMware View 4.6 (because View 5.0 isn’t GA yet). I found that when I upgrade the VM version and VMware Tools of my “Parent” Windows 7 VM, then recompose the Pool, the View client can no longer connect to the Desktop over PCoIP!
Here’s some more details, I’m using a security server in a separate VLAN from the Connection Server, but even if I connect the View client directly to the Connection Server, the behavior is the same. It acts just like the PCoIP port is blocked (it’s not BTW); first the black screen, then the session dies.
If I choose the snapshot made before the HW version and Tools version upgrade, and re-recompose the pool, the client connects as expected. There are no other apparent differences between the “working” snapshot and the “not-working” snapshot, so I must conclude that VMware View 4.6 is incompatible with VM v8.
If this is, or is not the case, or you have a workaround, please let me know!
Edit: thanks to the very first comment, I reinstalled the View Agent on the parent VM an viola’, it worked like a charm.
Brian Ragazzi 
Have you tried uninstalling the view agent and reinstalling it after upgrading VM to new VMTools and VM version 8? I had the same experience when I upgraded from vcenter 4.0 to 4.1 and installed new VM Tools. After uninstalling and reinstalll View 4.0 agent, it all worked again.
Ok, so, that worked and I feel like a dumb@ss. :). Thanks for the tip!
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2006216
Great find Stefan! I’ve since upgraded to View 5.0. This incompatibility is good to be aware of.