We have already for some time issues when using 2 bigs screens in a PCoIP session in windows 7 VM’s
We had a workaround and used an XP driver to solve this (we lost the 3D and aero and stuff but this was not an issue in this case)
Today we finally found a workaround.
Shut down the VM, edit the .vmx file and add at the end the following line
mks.poll.headlessRates=”1000 100 2″
or you can use the vsphere client to change this -> There is a KB that describes it