Actually, I think I may know some of what's going on. The folder physically resides in another website, but is part of an app that's bound to other sites through virtual directories in IIS.
When I access the uploader from the 'physical' site, it loads ok...when I try it from a client site, it doesn't run.
Is there something specific that needs to be changed someplace to allow it to work "through" virtual directories?
Thanks again...
GenNS