I haven't noticed this on any of my WP sites except the new one I just set up. I'm trying to upload a few files, and right on the front page, I'm putting a link to a PDF file. I upload the file (using the browser uploader, since Flash 10 broke the flash uploader), and for the link type, I choose "Link To File" and insert. When I go to the HTML view, I confirm that the link does point to "http://www.kungfu-silat.com/wp-content/uploads/2008/11/gungfuad.pdf"
However, as soon as I hit Save, that link changes to "http://www.kungfu-silat.com/home/gungfuad" (the "post" location of the file). If I manually change the URL back and save again, it reverts again upon save.
The file is present and accessible. I can get to it without any problem by using the direct URL. It's just that WordPress won't let me save that URL in the page. What gives?