I too, have trouble; and, I believe ig-pagebuilder is a much needed plug-in… not just for a more “visual approach to editing,” but for learning, as well.
I’m troubled with re-editing a page and finding it “blank!” In layman terms, “At times, elements and element-content do not repopulate the page-builder editor or even the native wp editor” In short, it is as if you are editing a new page with no content, yet when I view the page opened in a new window from this “elementless” event-page, the page displayed in my browser appears in-full. And. if I initiate an edit from the browser in which the page appears appropriately displayed, all the elements disappear upon returning to the editor even though the page-id and/or short-code is that of the same page.
Sorry for the lack of familiarity with the vernacular… I’m an MD/engineer and traditional “analytical” computer programmer.