I am also having this problem as of the latest update. I am also unable to move widgets between sidebars.
This only happens when both Yoast SEO and Page Builder by SiteOrigin are on at the same time. When one or both are off, I can edit the widgets per normal.
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This reply was modified 7 years, 11 months ago by spiralsalamander. Reason: Adding more detailed info re: bug effects
