upload error

I use iWeb 3.0.4 (601)

I also use Freeway Express. I use a MacHighway URL to upload sites for clients to see, before I upload the approved version to the client's domain.

This works well from Freeway Express and Cyberduck.

I made a quick mockup in iWeb today, and tried to upload to my URL for client to review, but it refused to upload, giving the following error msg:

Can’t create the file “index.html.” The disk may be damaged or full, or you may not have sufficient access privileges.

I got in touch with MacHighway and confirmed the problem is with iWeb (uploading with Cyberduck was successful).

I tried to "publish to local folder" instead, but that gives me a non-descript "upload error".

The site icons are all red, btw, whereas the icons of other sites are blue.

Can anybody tell me what's going and how to fix this? Thanks.