External link popularity block doesn't show up

Hi,
I have installed the module External links popularity http://drupal.org/project/pop_links and configured it for one content type, I've also set the permissions. The Popular links block is not visible in my sidebar when I enable it on the blocks page.
I am using version 6.x-1.4 in Drupal 6.13.
The theme is Simply Modern 6.x-1.5

External link popularity settings:

click points lifetime: 1 week
statistics lifetime: 1 week

node types: box for two custom type of contents. One is a feed item generated using FeedAPI that includes the link to the original article, and the other is the blog syndicated that includes a link to the blog.

tracking by role: all boxes left blank (to track all roles)

Voting API settings:

anonymous vote rollover: 1 day
vote tallying: tally results whenever a vote is cast
record external click: All roles checked

pop_links module permissions
access link popularity stats: All roles checked
access link popularity stats: All roles checked

The site, still in the process of development is http://todoele.org/todoele20/.
The nodes with the external links are in this page: http://todoele.org/todoele20/category/blogs-sindicados/blog-de-fedele
The log shows that the clicks have been recorded, but the block does not show up?
Any idea?
Thanks,
J.Suarez