Last search term in list file executes twice

I'm back to evaluating Screen-Scraper Pro after a long hiatus.

The first scraping session I have attempted has gone well, except for one issue I have been unable to resolve. I expect there is a simple solution, but I have been unable to find it.

My scraping session is similar to that detailed in Tutorial 7 where a text file is used to submit search criteria to the scraping session. Everything works except the scrape session for the last search term (and only the last search term) is executed twice.

A script file is used to invoke the trace. I've inserted some debug code in the script to assure that the number of iterations is equal to the number of search terms. I've set the extractor patterns to be manually invoked and have tried various "when to run" settings all to no avail.

Any suggestions for where I might look to resolve this?

Thanks.