Agree that this plug-in no longer works with WP 3.4.2 & BP 1.6.
You can configure it, create a Wiki Page, and have the Wiki page listed in the group wiki tab. However, when you edit anyone of the wiki pages, you get this tiny text box for text entry. And when you save the page, nothing is saved at all. This is too bad. I am de-activating and deleting this plug-in.
I doubt this plug-in will get fix, if at all, anytime soon.