Thanks
It still doesn't work, but I think it just don't work with Thesis 2.1 because you create all the templates in Thesis using drag n drop, and I think the templates is saved in the database – there is no template files (php files) in the template directory.
It would be nice to have this plugin working with Thesis 2.1, but I think you need to look at the Thesis docs, and create a Thesis Box (or something like that.) 
Thanks!