Recent comments component on the home page does not show the latest comments

The GoGreen home page contains a 'Recent comments' component. However, the comments shown there are not the latest.

Steps to reproduce:
1. run GoGreen locally
2. open http://localhost:8080/site/news/2011/11/solarcooking-november.html
3. enter a comment at the bottom of the page and click 'Send'
4. login to the CMS as admin
5. click the 'Comment on Solarcooking november' item in the TODO list
6. click 'Requests -> Accept request'
7. open http://localhost:8080/site

Expected behavior: the comment we just added is shown on the home page in the 'Recent comments' block
Actual behavior: a very old comment is shown, not ours

The configuration of the recent comments component probably needs to use the right sort property and 'descending' order.