Problems site editing

[bi0xid]

Hello there.
In sites admin (​http://mysite.com/wp-admin/tools.php?page=sites), when I try to assing blogs, I have Invalid blog message.

And when I try to go to Blogs on this site, it tries to go to ​http://mysite.com/wp-admin/wpmu-blogs.php, which doesn't exist.

I have tested it in 3.1, 3.1.1, 3.1.2 and 3.2-bleeding with the same results.

It's weird, because the only reference to wpmu-blogs.php is in wp-admin/includes/update-core.php

P.S. I have upgraded from MU 2.8.4 to 3.0 -> 3.1 -> 3.2

[nacin]

This is a plugin, not core. tools.php?page=sites is definitely a plugin, and the only reference to wpmu-blogs.php as you said is the script that removes that file.

[bi0xid]

Found. Nasty problem with crossed plugins.

Thanks a lot. And sorry.