Hi! I just upgraded Rhino 5 64bit to latest beta, the same for Vray (but to final version, not beta).
And I got the first problem…
Any idea, Chaos Group? 
Hello Matus-
I am not exactly sure what has caused the problem here. Can you check from Tools>Options>Plug-ins to see if for some reason the two rendering plug-ins are disabled? If they are disabled I believe that you will just need to re-enable them and restart Rhino for the changes to take effect.
Best-
Corey