WordPress MU

We installed mu wordpress but it's themes are not showing up

in admin area
Presentation link is showing white blank page
http://domain.com/wp-admin/themes.php
White page
Under link Site Admin > Themes also show white page.

But there are so many themes uploaded in wp-content/themes folder none is showing up

Can anyone suggest?

First thing I would have done would have been to check the error log.

That and do one theme install at a time. Do remember that those themes are designed for regular wordpress, not wpmu. You have to check them.

I am also having this problem.

Where can I find the error log?

You'd have to ask your host about that. Depends on what they're running. Should be an option with your hosting menu.

I have same problem on one domain. I did like there ....On main site and subdomains all ok... How to solve?????

also i have "You do not have permission to access this page." on domain.com/wp-admin/wpmu-themes.php

Are you logged in as admin?

yes i have only admin-user on that blog ( only 1 admin for all blogs and no one users)

And did you enable them in Site Admin -> themes?

yes...