after longer time i have realized that visual composer needs to be updated on my site. I have updated theme to the 2.7 and VC to 4.12.1 . After that i updated Redux Framework and suddenly the site stopped to work. I have disabled Redux and the site started to work. Unfortunately there is some problem with all the pages including the Home page – I can see only menu and nothing else.. Do you have any idea where can be the problem?