I recently installed 2.7.1 from subversion.
When I am editing a page, the links on the left hand side seem to have page.php added to them. So, for example, if I am editing a page and I click on Site Admin --> Blogs, it brings me to:
http://site.com/blog/wp-admin/page.php/wpmu-blogs.php
Instead of just
http://site.com/blog/wp-admin/wpmu-blogs.php
This produces a redirection loop error in the browser.
I think I've tracked this down somewhat. It only appears AFTER I have edited a page.
So... pick a page to edit; edit it; save changes; then I see the problem.
The act of saving the changes seems to add an errant "/" to the URL...
..http://server.com/blog/wp-admin/page.php/?action=edit&post=5&_wp_original_http_referer...
(Note the / after page.php)
Any ideas? Thanks.