Hi Respodu,
we got the same issue on our environment. We have the effect ,when we trying log on from a zeroclient with dual-Display to a vGPU-enabled Pool, the Zero Client crashes. The Loggon-Process to the VM goes on in the Background and so we are able to log on after couple of time.
Have you found a solution for your Problem?
ZeroClient t310 Firmware 4.7.1 or 4.8.0
Nvidia k1 grid_K120Q
Esxi 6.0.0
View 6.1.1