I upgraded my Wordpress websites yesterday to 2.2, using Fantastico to perform the upgrade. In both cases the sites started displaying this character (Â) anywhere in the posts where I had used a double-space (eg at the end of a sentence).

The solution is identified here.

Edit the wp-config.php file.

Comment out the two lines:

define(’DB_CHARSET’, ‘utf8′);
define(’DB_COLLATE’, ”);

By putting // in front of both lines like so:

//define(’DB_CHARSET’, ‘utf8′);
//define(’DB_COLLATE’, ”);