I have some trouble with the D.R.
Some black stripe on the render and a message with the textures missing files (please see the attached picture).
I checked all of this on your help page :
Different gamma settings - make sure all gamma settings are set to correct values on all of your PCs OK !
Rendering from a camera object native to other renderer - it is recommended to use native 3ds Max cameras only OK !
Using plugins unsupported by Corona - make sure that all plugins you are using are fully supported by Corona OK !
Plugins missing on some of the nodes - make sure that exactly the same set of plugins is installed on all of the PCs OK !
Strips may also appear if the nodes cannot reach some assets such as textures or models. Please refer to the following articles:
Missing maps/assets - DrServer is running with elevated UAC rights (as administrator) Required asset file could not be located OK !
All my slave have the acces to the nas in Z:/, the link is ok on max.
No troubles with vray DR.
Usually you don´t need to convert to UNC when drserver is run as a standard user and the drive is currently mapped (I presume both of this), so there seems to be another problem. But it´s for sure worth a try.
I just know all our machines have the NAS mapped to N and I remember getting this problem. It may have been you that helped me and suggested using UNC but ever since then it’s just part of my process for using DR otherwise I get missing textures.