I may have resolved the issue by using a different browser. I have five different browsers installed, and either switching browsers or clearing the cache seems to have solved the problem.
I never had this issue before I installed WP Discussion Forums, but I’ve also never run WordPress 5.9 (which came out about the same time), which changed the management interface.
Thank you for the response. I focused on WP Discussion Forum as the “new” element, but the root cause may be something else.
