[Mediawiki-l] Ampersand in title causes truncation

I have a site which contains information about a role-playing game I run, as a result, I keep a page for the game itself. If you visit:

http://www.ajs.com/ajsw/index.php?title=Dungeons_%26_Dragons

You can see the page just fine.

If you visit:

http://www.ajs.com/ajswiki/Dungeons_%26_Dragons

You get a blank page for the title "Dungeons"

Am I missing something here? This worked previous to my upgrade to 1.6.5 from 1.6.3, I'm almost certain, and I'm SURE it worked under 1.5.5, as that's when the page was created.

I did the ajswiki/ajsw separation according to the guidelines on the MediaWiki site for avoiding robot spidering of edit histories and the like.

If any element of my config would be useful, just let me know.

Thanks.