Last modified: 2007-01-17 18:31:55 UTC
Using r19394 (but this happens in Wikipedia with r19370 too) Special:Undelete returns a blank page when previewing a deleted revision.
The Apache log says: "[error] PHP Fatal error: Cannot access protected property PageArchive::$title in [blabla]/includes/SpecialUndelete.php on line 617"
(Reverted from severity normal to severity critical. Sorry, my mistake.)
Fixed in r19395.