Trouble with Wiki slug

I bought and installed the wiki plugin. I can make wikis, and I can view them via the backend.

However, I can’t see the wiki page (the slug not working).

Also: I installed a tab plugin which allows widgets in tabs (pullout widgets is the name of that plugin). And now my wiki widget is stuck to the bottom of the site.

The first problem (slug not working) was a problem even before the other plugin was installed.

Site in question is:

Any ideas what to do?