I have the same issue- 'older uses not getting the updates', I would also like a 'Reset to default' button next to the customise this page. Is there a tracker for this, I coulden't see one but i'm pretty new at this.
I think the issue is here: 'my/index.php'
<!--
if (get_home_page() != HOMEPAGE_MY) {
if (optional_param('setdefaulthome', false, PARAM_BOOL)) {
set_user_preference('user_home_page_preference', HOMEPAGE_MY);
} else if (!empty($CFG->defaulthomepage) && $CFG->defaulthomepage == HOMEPAGE_USER) {
$PAGE->settingsnav->get('usercurrentsettings')->add(get_string('makethismyhome'), new moodle_url('/my/', array('setdefaulthome'=>true)), navigation_node::TYPE_SETTING);
}
}
--!>