I recently upgraded to WordPress 3.1 from WordPress MU 3.0.3. The upgrade went successfully, but when I click the Update Network button (I have quite a few blogs on MU) I get an error "The page isn't redirecting properly". This seems to be happening to quite a few people at various points in the installation so I dug around in the boards and followed all of the advice.
*I disabled all of the existing plugins
*I changed the theme to the default theme
*I installed the Permalink Fix & Disable Canonical Redirects Pack
Still no clean update to the other blogs. Any other advice?