I have the same problem as:
http://mu.wordpress.org/forums/topic/14223
However, it gives this error in all browsers.
I am trying to install it on a localhost, which has an alias.
One is called http://webserver and the folder it is in is called wpmu.
(http://webserver/wpmu)
I tried to install it on a PHP5.3 windows server and a PHP5.3 ubunutu server. I followed the installation steps (inc the 777 chmod).
I get a lot of errors, but they are notices and deprecated (its a development machine, so its fine)
If i fill in the wrong user credentials in any browser, it says cookies are not accepted. That seems odd.
If I fill in the right credentials, it redirects. It says this:
http://webserver/wpmu/wp-login.php?redirect_to=http%3A%2F%2Fz0rf%2Fwordpress-mu%2Fwp-admin%2F
Any ideas?