WordPress MU

My webhost installed some Python softwarek, which shouldn't have affected my WPMU install (but did anyway). Now it shows "No WPMU site defined on this host. If you are the owner of this site, please check Debugging WPMU for further assistance." across three domains and the admin interfaces for each.

One possible cause: my php.ini looks emptier than it used to be, but I haven't looked at it in a while. Could someone post an example one?

Can anyone help me with my problem?

Your php.ini file wouldn't be standard if it was just for your account. ;)

I admit, it's kind of hard to help if your host added things to the server and then it borked. They may have accidentally & unknowingly removed or reset some things.