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This may be a plugin or theme conflict. Please attempt to disable all plugins, and use one of the default (Twenty*) themes. If the problem goes away, enable them one by one to identify the source of your troubles.
Hey TP, thanks so much for your input.
Yes, it is the theme. Is there anyone from Kadence Themes in this Forum that can help me out?
I recommend asking at https://projectdmc.org/support/theme/kadence/#new-post so its developers and support community can help you with this.
Thread continues at https://projectdmc.org/support/topic/editing-screen-shaking-after-wp-update-2/