Hello - that works OK here, but I do not have Vray or Enscape - I guess I’d block VRay and Enscape in Options > Plug-ins, then close and restart Rhino and see if the problem persists.
I am having this same problem with Enscape installed, was able to see an error on the cmd that read something like:
‘error in nameddisplay pipeline’
or
‘error in display pipeline’
can confirm that with Enscape unloaded the named views that were saved in rhino disappear, seems that Enscape ‘steals’ the named views when it operates on a file…