Categories in wiki

I have an existing mediawiki site at legalwikipro.com/wiki. I am trying to move it over to a new legalwikipro.com/wordpress site with your wiki plugin that I just purchased. The mediawiki site is staying live, and I am copying content over to the legalwikipro/wordpress site, a bit at a time.

I have completed about ten articles, and have added categories and tags to each. However, I can not "see" the categories in the normal "categories" widget. Nor can I get tags to appear in the tag widget.

Any idea what I may be doing wrong? I am using the "Standard 3.0" theme (standardtheme.com). I have also tried it on TwentyEleven, with no joy.

I'm wondering if my existing (live) mediawiki installation may be playing havoc with things. The new wordpress version has not gone public yet.

Ideas?