Thank you so much for your help! I hate when I miss something that is obvious! I actually remember this setting, “Theme Compatibility”, now that you mention it.
Because I had moved the archive-wpfc_sermon.php and single-wpfc_sermon.php and their css files into the theme directory, that override was not working. I deleted the files and the override worked and my sidebar is back!
Thanks again for your time on this and the extra set of eyes!