The migrate process saves the status of each running migration in the database.  Any error in the code will abnormally terminate the process so the database won't be updated properly and will keep saying that "something is still running".   In Drupal I had a look through the error log and came across the following message: Migration icon_migrate_species_json is busy with another operation: ImportingHowever, this shouldn't be the situation and I had no scripts running.  Now...