ISSUEAfter importing a new license file for Nintex Workflow or Forms, the following message might still appear in the designer:
Your license for this server has expired.
Option 1Make sure that the SharePoint Timer Service is running. If it isn't start it. If it is, restart it. Perform an IISRESET.
Option 2If an IISReset fails to resolve the issue, clear the SharePoint Cache. For more information, see SharePoint 2010 – Clearing the Configuration Cache.
An IISReset should be enough to resolve this, as it will trigger the property update, however if the configuration cache has not been cleared/refreshed in some time then working through the above may be necessary.