Sorry if this has been reported, but I couldn’t find it in the forum. I just updated to 5.1 on one of my sites. I’m using the Classic Editor Plug-In, if this matters. The shortcodes in my existing posts all still seem to work, and I’m able to add my existing shortcodes to posts, but I can’t get to the settings of Shortcoder anymore to edit shortcodes or to add new ones. In the list of plug-ins, no “settings” is shown next to Shortcoder, and shortcoder doesn’t show up in my list of settings either.
In my other site, I’m still at 4.6 and I have no problem accessing shortcoder’s settings.