We justed installed Vray for Maya (before only Mental Ray).
When i start a new job it will start rendering on an instance. But in the standard configuration Maya for Vray is set for 2017 (we work with 2019)
So it starts rendering but stops because it cannot find the path.
Then i change the settings in the template on the instance to the correct path.
But now the dispatcher does not assign the job to the machine anymore.
The same thing happens with the other machines. First it gets the job assigned when it is on the default setting with the path to 2017.
As soon as i change the template settings it will get any vray job assigned.
Double check that after you re configure a client to Vray 2019, the templates/job are not in the clients exclusion lists (they prevent the job to be started again). You can purge them right clicking on a node and select purge templates exclusion list and purge jobs exclusion list. It is intended by design after a startup error like the one you get.