There is a bug in WordPress 3.3.1 causing the issue. It may affect other versions as well.
To solve the issue you can update WordPress to the current stable release and do integration testing afterwards. Or you can do a quick bug fix.
To fix the bug:
- Open file blog/wp-admin/includes/screen.php in your favorite text editor.
- On line 706 find the following PHP statement:
<?php echo self::$this->_help_sidebar; ?>
- Replace it with the statement:
<?php echo $this->_help_sidebar; ?>
- Save your changes.
Hope it helps you.