Did everything before I posted this request. It looks there is a problem with the theme code or there is a conflict with standard plugins. Visual Composer 5.1 didn’t work in BackOffice (I cannot insert any shortcode from editor – selection doesn’t work) and after latest update of the VC (5.4.2) – the issue stays. This is the most critical issue… as I cannot edit or create any new post and this is the same issue for the Masonry Media Grid as it works based on JavaScript as VS.
Thank you for sharing any thought or idea how I can fix it,
Vlad.