BuddyPress.org

You may need to turn this:

<div id="respond">



<div class="comment-avatar-box">

<div class="avb">

<?php if ( bp_loggedin_user_id() ) : ?>

<a href="<?php echo bp_loggedin_user_domain() ?>">

<?php echo get_avatar( bp_loggedin_user_id(), 50 ); ?>

</a>

<?php else : ?>

<?php echo get_avatar( 0, 50 ); ?>

<?php endif; ?>

</div>

</div>

into this

<div id="respond">



<div class="comment-avatar-box">

<div class="avb">

<?php if ( bp_loggedin_user_id() ) : ?>

<a href="<?php echo bp_core_get_userlink( $comment->user_id ); ?>">

<?php echo get_avatar( bp_loggedin_user_id(), 50 ); ?>

</a>

<?php else : ?>

<?php echo get_avatar( 0, 50 ); ?>

<?php endif; ?>

</div>

</div>

You can try that out to see if that works for you.