Public help key: http://help.nintex.com/en-US/nintex2016/current/#cshid=108236
The Nintex Live Workflow Queue Service is in a “starting” status (with no start/stop link) for a prolonged period.
Nintex assemblies have not been refreshed by existing processes.
Manually refresh Nintex assemblies using the following procedure.
Delete the provisioning job as follows:
On the Central Administration Home page, click Monitoring.
Click Review job definitions.
Click the job “Provisioning Nintex Live Workflow Queue Service on [SERVERNAME]” and then delete the job.
Restart the SharePoint Administration Service.
Restart the SharePoint Timer Service.
Run the IISRESET command.
To start the service on the current server, do the following:
On the Central Administration Home page, click Application Management.
In the Service Applications section, click Manage services on server.
Click Start for Nintex Live Workflow Queue Service.