WordPress 2.0.2. Cannot change the post.

Problem: Once the post have been written, you can see it on your site. Great. Then you want to edit this post again to correct, say, some typos. You are doing this a couple of times. Finally you find that the very last changes are lost.

Decision: At your WordPress panel Options –> Writing –> Update Services you have to delete the link to pingomatic site and confirm the update. This happens on the very slow and overloaded sites (thank to your hoster).

Updated: Final decision have been described there http://wordpress.org/support/topic/54870#post-299621. Yes, disable the cache at wp_config.php and it will work. No crap like to delete pingomatic, upgrade to wordpress 2.0.2, do not to use WYSIWYG editor.

wp-config.php:

define('DISABLE_CACHE', true);

Now it works for me