Members Directory 404 Error! Page Not Found

Hi, installed Members Directory 1.0.8.1 and while the member's list page was showing, there were two instances when I encountered the 404 errors:
1. Members profile page
2. Search for a member

Am using post and comments indexer, plus friends, communities and global site search too. Have Membership installed but not activated yet, trying to sort this out first.

Also, was wondering if it would be possible to tag a friend like @johndoe in a comment or in the communities section.

Thanks a million. And keep up the good work guys.