Quoting Jason Flatt drupal@oadaeh.net:
I have a site up that has an odd behavior I'd like to correct. Whenever a submit button is pressed, even for logging in, the www part is dropped from the URL, and all subsequent pages are displayed sans www. The site appears to work correctly either way, but I'd still like for it to stop switching over. Is there a way I can fix that behavior, and if so, how?
It is an apache configuration issue. You must be redirecting the URL in one of the config files.
Earnie