Network.php is blank, can’t create a network.

have you added

define('WP_ALLOW_MULTISITE', true);

to wp-config.php ??

talk to your webhost. There’s a good chance they have disabled this from showing if they won’t support it.

Go check with them first, and if they give the okay, then come back here and we’ll do some troubleshooting.

But have you set up the network before – either on this host or any other?

I have upgraded an MU install.

then you are already running a Network.

Network = MU. No need to set it up again.

In its own database?

Anything in your error logs?

Honestly, this is the first (and since only) time I’ve seen it come out with nothing under the menu.

Check the html source of the page – does it render everything?

I’m having the exact same problems. Is there any info I can provide to help out?

Nothing in the error logs. The html stops at <p>Fill in the information below and you’ll be on your way to creating a network of WordPress sites. We will create configuration files in the next step.</p>

Which means it’s dying an not rendering the rest of the page.

Have you asked your webhost if they support it?
Did you turn off all your plugins?

@walgarch – see the info I asked for already. 🙂 error logs, plugins deactivated, host support.