Nintex Workflow 2010 Option Missing from Site Actions Menu
After activating the Nintex Workflow Feature in a Site, the Nintex Workflow option does not appear in the Site Actions menu. However, the option to Create/Manage Nintex workflows is available in lists and libraries.
Go to Central Admin.
View System settings.
View Farm solutions.
Navigate to NintexWorkflow.wsp and click.
Ensure that the web app is listed under " deployed".