Having the same problem since I moved the Blog to a new server. Other plugins continue working fine. Maybe a PHP Version issue? Error log says:
PHP Warning: call_user_func_array(): Unable to call StrictlyControl::Init() in /(…)/wp-includes/plugin.php on line 395
WP Version 3.0.4
Strictly Google Sitemaps Version 1.0.8
PHP Version 5.2.0
