I have a web site which is edited on a weekly basis. For over a year I have
been using Contribute to edit the web site.

Today Mysteriously I cannot edit any pages on the site although Contribute is
not experiencing any server errors (etc.). Here is the behavior:
1. I connect to the web site.
2. I go to any page on the site and click the "Edit" button
3. The page goes through the normal motions of getting me to the "edit" view
('Creating a draft of this page...', etc.)
4. I edit the page.
5. I click "Publish" to Publish the page to the server
6. Contribute goes through the motions as if it is publishing the page
("Publishing your draft ot the server...")

When the page refreshes in Contribute, I see the old content. I verified it
by downloading the page as well as looking at it in a browser--it's the old
content.

Following doing this, if I again try to edit the page, I see the edited
content, but, again, if I publish it goes back to the original content.

Other notes:
- Tried Contribute 3 on a Mac and a PC
- No permissions or server setup have changed
- The user(s) have publishing rights and were able to publish without a
problem for the past year
- There are not .LCK files kicking around in the project folder on the web
server

Has anyon ran into a problem like this in the past? I work in web
devleopment, so I'm fluent in the ways of web publishing, but this one's got me
stumped.

Nothing on the web server has changed (FTP settings, password, Contribute
setup, etc.)