I had the same problem. After updating the theme to 4.4.6 and following your instructions, I still have the same problem.
Specifically, editing a page opens up the editor but only shows Visual and Text tab options, displays the background code, but does not offer the Visual Composer (Page Builder) options as before. See image attached.
FYI, this problem of mine actually was happening before I updated the theme.
Suggestions?
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