Yes, I disabled all the plugins but no go. But today I diligently closed all browser windows and deleted the cache again and, finally, resolved the issue for one of the last two pages that had the problem. I can get by without editing the last one, though, as the critical elements in that one are done through GP.
As time goes on, it must be a bear for the GP and Elementor teams to make sure updates don’t cause problems with each other (or other themes and plugins), given the myriad of ways site developers can combine all the functions. Even though it’s sometimes confusing or annoying to figure out glitches after updates, it’s still worth the flexibility and ease of use when building the site.