Can’t see tag pages

Hi, I installed a tag cloud widget which you can see on my blog’s main page.

http://www.occams-razor.info

However, when I click on any of the tag links, whether in the tag cloud or not, the page which should show all posts for the tag does not come up.

I did override the tag base to be /tags to minimize link issues since I ported over my blog from MovableType.

It is not clear to me what the Tag Cloud widget actually calls. Maybe it is for a template that did not come with my theme and I need to clone it or something.

Any help would be gratefully appreciated.