Forum Cannot access forum after upgrade to 4.0.6
 

I just upgraded to 4.0.6 from 0.5 and now when I click on my forum link it keeps sending me back to my CMS page....can anyone help me out here.

If I type in www.mysite.com/forum it takes me back to www.mysite.com

However

If I type in www.mysite.com/forum/subforum/thread it goes to the subforum and the thread