Something has gone wrong with the wiki. Every page says something like
Warning: Parameter 1 to Language::GetMagic() expected to be a reference, value given in /home/mnewman/public_html/wiki/w/includes/StubObject.php on line 58
I can no longer edit and, having logged out, can no longer log back in.
It would be good if someone was able to explain the PM mixup too.