I've found the problem with the plugin that causes the settings page to not display and I have emailed the plugin author so hopefully he will read my email and respond. In the meantime here is a quick fix:
1. From the plugin editor in your WordPress admin panel select the Robots Meta plugin for editing.
2. In the file robots-meta/robots-meta.php find the line:
class RobotsMeta_Admin extends Yoast_Plugin_Admin {
and replace with:
class RobotsMeta_Admin extends Yoast_Plugin_Admin_ {
(note the added underscore)
3. In the file robots-meta/yst-plugin-tools.php find the line:
if (!class_exists('Yoast_Plugin_Admin')) {
and replace with:
if (!class_exists('Yoast_Plugin_Admin_')) {
(note the added underscore)
and in the following line:
class Yoast_Plugin_Admin {
replace with:
class Yoast_Plugin_Admin_ {
(note the added underscore)
This should tide you over until Joost decides to update the plugin.