Thread:Project:Support desk/skins broken for me starting with svn revision 74966

I have a MediaWiki installation that I keep updated to svn head with a nightly script. It was working great until a few days ago, when my skin suddenly became broken. The page renders how it would look if there was no skin at all. I tested with different computers and different browsers, and I tried switching skins (both user preferences and default skins) and nothing fixed it. I went through the subversion log looking for commit comments related to skins, and discovered that the rpoblem started at revision 74966. if I go back to revision 74965 my problem immediately clears up and the monobook skin renders as normal.

My mediawiki install is really simple. I don't have any customizations to speak of other than my rather plain LocalSettings.php

I have another Mediawiki install running on a different virtual host on the same server, and it is at svn head and running with no such problems, but I cannot figure out where the two installs are different in any meaningful way.

By the way, both sites (the problem one and the working one) are using PHP 5 FastCGI and the MySQL version 5.1.39