Hi,
Yes, I too had the same issue. In fact I joined just so I could post my found bugs and how I fixed them to help out around here:
Here's the fix in bpdev-youtube.php:
function bpdev_youtube_setup_nav() {
global $bp, $bpdev;
bp_core_new_nav_item( array(
'name' => __( 'Youtube', 'buddypressdev' ),
'slug' => $bpdev->youtube->slug,
'position' => 80,
'screen_function' => 'youtube_show_settings',
'default_subnav_slug' => 'show'
) );
#bp_core_add_nav_item( __('Youtube', 'buddypressdev'), $bpdev->youtube->slug );
#bp_core_add_nav_default( $bpdev->youtube->slug, 'youtube_show_settings', 'show' ); //Set aggregator_blog_settings as default page