Q&A and WPMU themes

Hi,

I'm having problem when I want to use the Q&A plugin with some of the WPMU themes (ex: Business feature, Edu-clean and Gallery)

My problem is the same : the sidebar does not appear in the question posts.

I guess that there is something to do due to the fact that questions are custom posts but I do not know why? Could you please advice?

Thanks a lot!