Thanks Eric, for taking a look at the page. I appreciate your help as I'm in over my head...
I changed the select list as you suggested. Now the dropdown list and the results list clear, but search and list values are no longer retained in the dropdown list.
I also tried editing the search statements and changing the Dynamic list values to see whether this affected the result.
I am trying to get this form field working before incorporating it into another form or at least get the form working independently.
I sent you both the results, and the search page, in the attached zip file. Please let me know if you need anything more.
Thanks again for your help.