Path to pictures and galleries is wrong

Hi, I've installed this module on my Drupal 6 site, and generally it works but pictures are not displaying. Looking at the URL that the browser is trying to recover it shows that it is looking for the file at
http://[baseURL][internal download path]
e.g.
http://www.example.com//home/sites/example.com/private/picdownloads/pict...
I'm using the private download method from core drupal and I have pathauto (but the same issue appears with pathauto off).

Presumably this module is specifying the download path as [base path]+[download path], and I can't see how to change that?

Of course, my problem my not be to do with this module, but I can get pictures to display with other modules.

Thanks.
EdP