it´s me again

I have a network render setup with two slave machines.
So far, everything is working perfectly.
The problem comes when I plug a displacement texture to a mix tex node and start an animation render.
The render starts normally, but after some time the slaves stop working. When the desired amount of samples is almost reached (like 1985/2000),
The render either stops and it keeps going in that state forever or it crashes the display driver on the master machine.
My question is, are these known issues adressed in version 2.1x?
Does it make a difference for the render servers (v.2.65) and deamons if I install the 2.14 Standalone ?
My Setup:
Master: Win8.1| 590 GTX | i7-4930k |32GB
Slave1: Win8.1| 590 GTX | i7-860 |16GB
Slave2: OSX | 780 GTX 6GB | i7-3770k |16GB