Just to add one further note to this. At the moment my computer shows as having 2 connections to MySQL even though I have closed the file that has the ESS references. To get rid of the connections my options are to Quit FileMaker entirely or to kill the connections through MySQL Admin.
Thank you for your posts.
I have forwarded both posts to our Development and Software Quality Assurance (Testing) departments for review. If any additional information becomes available, I'll let you know.