Widget doesn’t show up

Based on the update, I switched to the new plugin (from the previous jQuery plugin) – however, it would not show up as a widget. I made sure the older jQuery plugin was deleted, I removed the new plugin, reinstalled, still not showing.

Shortcode was available (so it was at least installed in some state). However the formatting didn’t work for my needs (probably a different issue, didn’t see any docs that worked for what I wanted (matching it to the widget-formatting under the old plugin).

Switched back to the old jQuery plugin, it still works fine. No new plugins, themes, changes, etc. Everything has been in an unchanged state for several months.

Running WP 5.2.2, everything is current & updated.