All non-related plugins were deactivated.

The menu item Woodmart->Theme Settings disappeared.

I activated plugins one at a time until I activated “Quad Menu” and the “Theme Settings” returned but when clicked on gives the “not allowed to access” error. This is as far as I got troubleshooting. It’s related to the Quad Menu plug-in whereas the woodmart “Theme Settings” appears and disappears.

What is the next step? I left the plugins active from top to bottom in active state up to the “Quad Menu” where it’s also active. All other non-releated plugins are deactivated. I have no idea at this point if it interferes with your theme or it, along with another plugin, creates the error.