I know variations on this have come up in the forum, but my experience doesn't seem to match other postings.
When I test the Contribute feature in IE6, everything goes fine. (Per the instructions I added the image/pjpeg to the security settings.) Everything goes fine EXCEPT at the very end, instead of the Thank You message, I get a totally blank screen. Just white space and nothing else. But unlike what I read on the forum, if I hit "back," I don't get an error message. It goes back one page just like it should to the consent form. And THEN, if I go forward again,I get the Thank You screen just like it was there all along.