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@koen,

Are you using the most recent version of Subscribe2 (8.2) ?

@koen,

Are you using any Registration or Members plugins?

@koen,

In the classes folder for the plugin you should find a file called classes-s2-admin.php. At the top of this is a function called admin_menu() and it looks like this:

add_menu_page (__('Subscribe2', 'subscribe2'), __('Subscribe2', 'subscribe2'), apply_filters('s2_capability', "read", 'user'), 's2', NULL, S2URL . 'include/email_edit.png');

$s2user = add_submenu_page('s2', __('Your Subscriptions', 'subscribe2'), __('Your Subscriptions', 'subscribe2'), apply_filters('s2_capability', "read", 'user'), 's2', array(&$this, 'user_menu'), S2URL . 'include/email_edit.png');
add_action("admin_print_scripts-$s2user", array(&$this, 'checkbox_form_js'));
add_action("admin_print_styles-$s2user", array(&$this, 'user_admin_css'));

$s2subscribers = add_submenu_page('s2', __('Subscribers', 'subscribe2'), __('Subscribers', 'subscribe2'), apply_filters('s2_capability', "manage_options", 'manage'), 's2_tools', array(&$this, 'subscribers_menu'));
add_action("admin_print_scripts-$s2subscribers", array(&$this, 'checkbox_form_js'));

$s2settings = add_submenu_page('s2', __('Settings', 'subscribe2'), __('Settings', 'subscribe2'), apply_filters('s2_capability', "manage_options", 'settings'), 's2_settings', array(&$this, 'settings_menu'));
add_action("admin_print_scripts-$s2settings", array(&$this, 'checkbox_form_js'));
add_action("admin_print_scripts-$s2settings", array(&$this, 'option_form_js'));
add_filter('plugin_row_meta', array(&$this, 'plugin_links'), 10, 2);

add_submenu_page('s2', __('Send Email', 'subscribe2'), __('Send Email', 'subscribe2'), apply_filters('s2_capability', "publish_posts", 'send'), 's2_posts', array(&$this, 'write_menu'));

$s2nonce = md5('subscribe2');

Try replacing that code with the following:

add_menu_page (__('Subscribe2', 'subscribe2'), __('Subscribe2', 'subscribe2'), "read", 's2', NULL, S2URL . 'include/email_edit.png');

$s2user = add_submenu_page('s2', __('Your Subscriptions', 'subscribe2'), __('Your Subscriptions', 'subscribe2'), "read", 's2', array(&$this, 'user_menu'), S2URL . 'include/email_edit.png');
add_action("admin_print_scripts-$s2user", array(&$this, 'checkbox_form_js'));
add_action("admin_print_styles-$s2user", array(&$this, 'user_admin_css'));

$s2subscribers = add_submenu_page('s2', __('Subscribers', 'subscribe2'), __('Subscribers', 'subscribe2'), "manage_options", 's2_tools', array(&$this, 'subscribers_menu'));
add_action("admin_print_scripts-$s2subscribers", array(&$this, 'checkbox_form_js'));

$s2settings = add_submenu_page('s2', __('Settings', 'subscribe2'), __('Settings', 'subscribe2'), "manage_options", 's2_settings', array(&$this, 'settings_menu'));
add_action("admin_print_scripts-$s2settings", array(&$this, 'checkbox_form_js'));
add_action("admin_print_scripts-$s2settings", array(&$this, 'option_form_js'));
add_filter('plugin_row_meta', array(&$this, 'plugin_links'), 10, 2);

add_submenu_page('s2', __('Send Email', 'subscribe2'), __('Send Email', 'subscribe2'), "publish_posts", 's2_posts', array(&$this, 'write_menu'));

$s2nonce = md5('subscribe2');

Does that help?

@koen,

Okay, well that’s excluded one problem. Can you temporarily deactivate your other plugins (expect Akismet – I know that one’s okay) and see if it starts to work if Subscribe2 is the only active plugin.

Also, try using one of the default themes for a minute and see if that helps.

@koen,

It seems for checking on the ping.fm site that it is being closed down and replaced with seesmic soon. In fact they are talking about a June close down.

With that in mind I’d suggest you find a different social network plugin.