mce, suggest you attach the same URL fetch code to the [Catch Up] button, as you would have used in the initial population of the listbox - ie, reading the series catalog by a fetch from
http://tviview.abc.net.au/iview/api2/?seriesIndex
batch downloader has a similar refresh capacity (I assume the URL is the same that you are using)
(otherwise, I find I need to quit iViewNapper in order to do that refresh)