[Plugin: Simple Tags] Tag cloud not appearing, what am I missing here?

Installed and activated fine.

I put: [st_tag_cloud] in my innerWideSidebar.php where I want it to appear. All I get on the page is the text: [st_tag_cloud], no tag cloud.

I read somewhere that shortcode can not be used in sidebars, so I got a plug in that is supposed to enable it in sidebars, but that didn’t do anything. Also tried putting the [st_tag_cloud] in single.php just under the post, to see if it being on the sidebar was the problem. Same thing there. I just get the text: [st_tag_cloud]

What am I missing here?

Thanks for any help, Chris