Conflict with Themify

I’m using the Themify Ultra theme, which allows me to select a custom 404 page. When I have my custom 404 page selected there, accessing restricted pages takes me to the 404 page rather than the home page as Groups 404 Redirect is set. Disabling the setting in my theme enables Groups 404 to work correctly, but then I’m losing the benefits of the custom 404 page. Is there anything I can do? Perhaps the folks at Themify would help you with the incompatibility… Thanks for an outstanding plugin!