FTP publishes empty files/blank site

I am successfully publishing my site both to a local folder and to the MobileMe server:

http://web.me.com/scott.romans/SLE/Home.html

However, when I try to publish via FTP to an external server (which is the ultimate home for this site), iWeb sends empty folders (0B) and creates a blank website. (I can see this with Cyberduck.) When I use Cyberduck for the transfer, the same thing happens. When I use Transmit, the files on the external server arrive with the same size as they have in my local folder, but the website is still blank.

I was able to develop my website on my external server for weeks with no problems. Using Cyberduck, I would delete the old folder on the server and upload the new. Last night my navigation bar disappeared, and then I get this problem where I end up with a blank site. Ironically, there is one folder on the server that pre-dates the problems I am having, and when I upload to this folder, the site can be seen online, but the nav bar and several picture frames are missing. Here's the defective copy:

http://stlukesevanston.org/SLE/Home.html

I've reset Safari and also checked in Firefox, and I get the same problems.

Any ideas how to fix this? My parish will be grateful!