Private! Wordpress Access Control Manager not honored?

I have just installed "Private! Wordpress Access Control Manager" and find that it is not respected by Q&A plug-in - i.e. when going to mysite.com/questions, the questions page wil simply be displayed.

As "Private! Wordpress Access Control Manager" works well and as epxected on a few other sites I am running, I wonder how to get the same resault for Q&A pages...?

Thx,

Olaf

PS: And BTW: in the dashboard, under Questions -> Settings I have have assigned no rights to a Guest. Does not seem to have any effect.... ( a guest can just see all questions and answers, only once a guest would want to ask a question or give an answer would he be forced to login)