quicksilver1024 - 1:34 pm on Sep 4, 2012 (gmt 0)
My webhost fixed it for me! This is what was happening (his words):
"The issue was that permissions were set incorrectly, the files were uploaded as root and ownership needed to be set to the 'user_name' account, and the permissions set properly for SuPHP. This permissions error caused SuPHP to be unable to load the files as they were requested, and tried to spit out a server error page, however due to the Drupal redirects, the main drupal error was loaded instead."
So the fix: Reconfigure permissions and ownership.