My ISP explains that the error message indicates that there’s a table being called from the code that didn’t get created correctly. The table has a filename of harryconnolly_wp_wysija_is, which is similar to other table designators like harryconnolly_wp_wysija_queue.MYD
The problematic code doesn’t have a file extension, which could be an artifact or a symptom of the failure to create the file. Nonetheless, someone should search the code for the wysija_is string to find where it’s being called, and address the issue.
Thanks.
Brief followup, a screencap of the WYSIJA queries I get is here: