In an old SP 2010 system with Nintex 2010, when I click Site Actions, Nintex Workflow 2010, view the Workflow History List, the screen is empty. I know for a fact that many WFs have run in the site. How can I troubleshoot this?
How long ago did the workflows complete? Typically when I've seen these scenarios in the past, they are the result of the Workflow Auto Cleanup timer job running. By default, this will cleanup any workflow instances or tasks that have been completed >60 days ago. You can read more on a similar question at the link below:
**Note** This job will not delete entries from the Nintex Workflow History list or the Nintex Workflow Database, as this data will be stored in locations unaffected by the timer job. Just the workflow instance association will be removed.