Maybe it’s because of DirectoryIndex in .htaccess
Default behaviour of Apache could be overwritten.
Problem: DirectoryIndex index.htm index.html index.php
Ok: DirectoryIndex index.php index.htm index.html
@centicon Delete the index.html in / and /wp-admin/
We found a temporary Solution for the Plugin “W3 Total Cache”. Deactivate the “Page Cache” in General Settings. Addional we deactivated the “Minify”-Option.
I dont’t now if this Problem comes with 3.0 oder 3.0.1