VC: Tinymce error! Compatibility problem

Looking at the screenshot, the first error is “strange”. It suggests that Visual Composer cannot work together with other WordPress plugins that change the default editor and so disables its implementation of TinyMCE. The second error is probably a result from the first one.

Unfortunately Visual Composer is a “closed source” plugin, meaning that I cannot have a look at where this is coming from and why it happens. Your only option is to contact their support ( that’s what you paid for, right? 🙂 ).

In the past they had a problem when wpautop() is disabled in WordPress: https://wordpress.org/support/topic/plugin-conflict-visual-composer-and-tiny-mce-advanced. Perhaps try unchecking the “Keep paragraph tags” in TinyMCE Advanced and see if that helps.

Also there is another option now that you can use: Under “Administration -> Enable the editor enhancements for:” uncheck either the “Other editors in wp-admin” or “Editors on the front end of the site” (or both). This should leave TinyMCE Advanced active for the main WordPress editor but disable it for other editors that are added by other plugins.