WordPress MU

I moved a blog from a WP-2.7 installation hosted on a linux platform over to a WP-MU-2.7 installation hosted on a Windows platform. I did this by doing a database export, massaging the data a little, and importing with WP-phpmyadmin.

Since then, the site works perfectly, but whenever I want to change properties of a new or existing image on a page, both in the HTML and the Wysiwig editor, title="some title" attributes simply disappear when saving. After saving, they are simply gone. As in:
<img href="/some/path" title="some title" /> turns, after saving, into <img href="/some/path" />. I am at a loss. Could this be a bug? or some kind of platform dependency? Or the effect of some plugin?

I already tried disabling all plugins. To no avail.

The theme is a modified WP Multiflex 5.

Thanks for any help.

I remember something about a security issue with title tags but nothing comes to mind or I can find with a quick google.

Take a look at /wp-includes/kses.php, about line #152 down and add it back in to the img array.

edit: I notice alt tags are allowed for the img tag. Strange that one is while the other one isn;t.