Share This Plugin not Working in Some Themes

I've started adding the Share This plugin to several of my sites and was frustrated on one site to see on the front page "SHARETHIS.addEntry(" and a lot more ugly text. Upon investigation the < script tag enclosing the SHARETHIS javascript. So, I went on an investigation. I looked in the share this forums and found some people reporting the same problem with no real solutions.

I tested putting the javascript in the header manually. That didn't solve it. I tried disabling other plugins and that didn't work.

Finally, I compared the source of the working page and the non working page and that's when I saw that the enclosing script tags were missing. So, I started looking at the template tag right before the sharethis plug. I noticed that the working site had <?php the_content('Read the rest of this entry »'); ?> the one that wasn't working was using the rss head of the article to get the summary text on the front page. <?php the_content_rss('.... so I replaced that bit and the sharethis plugin started working on the front page.

I like this because it also solved the problem I had with the popularity contest plugin not working.