Can't get it to work

Hi Dan,
cool stuff! I am working on my blog and this is simply an amazing addition. I am seeing a few issues though, perhaps because of my blog’s configuration:
1) I can’t see any “Tweet this” like buttons, once installed and activated the updated version of the plugin linked to in this page.
2) Is it possible to make “No Tweetbacks Yet” appear at the bottom of the post?
3) “Be the first to Tweet this post” sometimes links to the post itself, sometimes to Twitter passing the status. I think I read others’ comments above about the same.
4) I tried to tweet some test posts (when the “Be the first to Tweet this post” correctly links to Twitter), but I can’t see any tweetbacks.
5) The “My tweets” widget doesn’t seem to get updated.
For the 4) and 5), how often does the plugin automatically update the data?
Sorry for the many questions, but I’d really love to see this plugin working on my new blog!
I am using Wordpress 2.7.1 + Thesis Theme.

Many, many thanks in advance.