WPMU Themes + Coursepress Pro?

I can only get my site to look ok (that is, render course listing and other course press pages to render properly) with the CoursePress Theme, which is extremely limited in terms of theme power. I was using a theme from envato before, and that didn't work- I tried my site with one of your themes (Fixer, which looks perfect for me) and the course press pages don't render properly. What the heck? Can I only use CoursePress Plugin WITH THE COURSEPRESS THEME? IF that is not the case, please recommend a theme. I need this info as soon as possible. Thank you