For some reason, our connectors admin pages are all now blank!

There's nothing in the error logs apart from:
Thu Nov 24 09:34:27 2011 [4592][1][FATAL] Error: File [modules/UserPreferences/metadata/detailviewdefs.php] is missing. Unable to create because no corresponding HTML file was found.

But that wasn't around a time when I was doing anything!

Can anyone suggest how to get things back?!

Oh, and tried the backup I took yesterday, still can't see the pages!

Thanks
Nunners