I’m just experiencing the same troubles, the only solution for me would be an option to deactivate avia for editing some of the pages. The plugin “Cost Calculator” requires Visual Composer. So after spending a lot of money for plugins i’m not sure if i just should use another template. I mixed the two layout builders, and for one page it really worked. But for some other pages it’s not working. Every time i update my post now, wordpress just saves the avia layout / pagecode instat of the Visual Composer… I would be very happy if there would be a soulution…