I have this problem since this morning. Rhino fails to load the Vray. I updated my Rhino and Vray with the latest builds but still cannot run the renderer.
Got a ticket but hope someone can help before the 1-3 business days
thank you
I got this explanation. It does not help at all:
As a first step please download and install the latest Rhino Developers Kit:
http://download.rhino3d.com/RDK/4.0/release/download/
V-Ray uses the RDK to access information needed by its advanced features.
Problem solved!
Thanks to Philipe Stoyanov from chaosgroup office in Sofia.
Philipe riched my pc using teamviewer and bring my vray back to life
thanks again
… can you share the solution with us? As of today our last ‘working’ version of Rhino 5 64bit expires .. I am forced to upgrade the whole lab.
And then VRay 64bit breaks.
Have tried everything .. no luck.
Thanks!
you have to reinstall vray in programfiles/beta this is where now the new Rhino installs,earlier it was programfiles/wip
Sorry for the delay on reply.
With the guy from Sofia office we reinstalled rhino and vray and all worked good. Shortly after same problem appeared again: Rhino fails to load vray. What I did was to go to Rhino options, Plug-ins and just put thick “enabled” on vray for Rhino.
I remember I tried the dongle just before the problem on another machine during the weekend. It could be that it cause this problem.. in such case that would be another bug
I had the same problem with the pervious Rhino 5 update. And I did everything stated too and it didnt work. Weirdly, the only way that I was able to get it to work is by going into options in rhino, then plugins, then going down to Vray and checking the enable box. Try that out.
When Philipe fixed your Vray, did he uninstall just Rhino5 or Rhino 4 as well?
I had this issue with V-Ray occur a few weeks ago. At the time I was focused on modelling rather than rendering so didn’t spend long trying to fix it (and failed). I tried installing the RDK, reinstalling V-Ray several times but nothing worked.
I’ve just discovered that renee81 got it right, you need to reinstall V-Ray to the Program Files/Rhinoceros 5.0 Beta folder rather than Rhinoceros 5.0 WIP, which seems to be the default in the V-Ray install. I’ve just done this and it’s fixed the problem straight away. It would be nice if there were a sticky telling people how to fix this, it seems to be a common problem.
only rhino5
but you can check if vray is active in the plugin list of rhino too.
Hi there,
any news about this prob?
After the last RH beta-update- i´had to do( reinstall ) it on all maschines ( 5dongles), again. i start to hate it. 
Thanks
mackl
marblepeak
Hi
Please send a email to the support team. That is the best way to receive help for this kind of issue.
Here is the email:
vrayrhino@chaosgroup.com
Best