Wikimedia Bugzilla is closed!

In case these matter:
* PHP: 5.2.1 (apache2handler)
* MySQL: 5.0.38-Ubuntu_0ubuntu1-log 

Create a page with this content:

==Header 1==
<pre>
<h1>X</h1>
</pre>
==Header 2==
<pre>
<h1>X</h1>
</pre>

Now click the [edit] for Header 2. Change the "X" to "Y". Click "Save page".

As you can see, all sorts of interesting and unexpected things happened. Header 2 got slurped inside Header 1 and there's a new Header tag: X with contents "</pre>"...

Kooky, eh? I'm having to [undo] many errant "Save page" operations daily. Large pages with lots of <pre> headers get contorted in all sorts of bizarre ways.

Thanks for your help,

j