Site breaks upon update

Hi, I updated to the latest version of the plugin, and it immediately broke the site. I put back the previous version from the backup, but it also stopped working properly (while at least the site is back and functions well). I used the plugin to also list members’ posts/pages that they authored, but the list is gone, replaced by a ? letter… Is there anything I could do to bring back the original functionality that was undisturbed up until the latest update? Thanks in advance ??