Conflict of a certain interest

Nested ul & li’s seem completely messed up (see « this post »:http://www.soours.com/wordpress/index.php?p=273). Could this be a conflict between WP & the Textile2 plugin ? I would then have to de-activate the plugin. A shame since I used MT-Textile a lot & 99% of this blog is imported from MT 2.661….
ToDo:
* de-activate Textile 2 plugin, check site no go
* activate Textile 1 plugin, check site no go