not finding directory main page

Hi, I have installed Wordpress Directory plugin on my site http://www.presentingarchitecture.com and everything seemed to go as per the install instructions except when I did a test listing whose address is: http://www.presentingarchitecture.com/blog/listing/joe-photographer/ I get 404 error. I resaved permalinks as similar posts suggested but that did not help. Under appearance, I did not have options for background, color, editor either

I also tried setting up a separate blog just for this plugin at http://www.presentingarchitecture.com/directory/ but that did not work either although test listing show like this: http://www.presentingarchitecture.com/directory/listing/test-3/

buddypress 1.2.8
wordpress 3.1
multisite

Thanks for your help!

Rob