I think I worked it out, thanks to the information you’ve already provided. I copied wp-content/plugins/buddypress/bp-themes/bp-default/members/single/plugins.php to wp-content/themes/frisco-for-buddypress/members/single. In that, I added the first two and last three lines below:
<div id="sidebar-squeeze">
<div id="main-column">
<div id="item-body" role="main">
<?php do_action( 'bp_before_member_body' ); ?>
<div class="item-list-tabs no-ajax" id="subnav">
<ul>
<?php bp_get_options_nav(); ?>
<?php do_action( 'bp_member_plugin_options_nav' ); ?>
</ul>
</div><!-- .item-list-tabs -->
<h3><?php do_action( 'bp_template_title' ); ?></h3>
<?php do_action( 'bp_template_content' ); ?>
<?php do_action( 'bp_after_member_body' ); ?>
</div><!-- #item-body -->
<?php do_action( 'bp_after_member_plugin_template' ); ?>
</div><!-- #main-column -->
<?php get_sidebar( 'buddypress' ); ?>
</div><!-- #sidebar-squeeze -->
Hope this helps others with the same issue.
