Black screen on PCoIP session may be caused by not enough Video card memory on the VM. You can follow below steps and connect the desktop via PCoIP again.
If you haven't access to View Connection Server Admin, please contact your administrator to do it.
Steps to increase Video memory of the VM via View Connection Server Admin:
1. Go to View Connection Server Admin console (https://<server>/admin)
2. Check the desktop pool setting (E.g. Category->Desktop Pool->Select the desktop pool and click Edit button->Desktop Pool Setting tab->Remote Desktop Protocol section)
3. Increase the value of "Max resolution of any one monitor" and save the changes
4. Connect the vCenter via vSphere client and power off the VM which you will connect from View client
5. Check the Video memory of the VM, it should be increased (default value is 8 MB) after powered off VM
6. Power on the VM and connect it with View client via PCoIP protocol
The black screen should not reproduce if there is enough video memory on the VM.
Thanks.