1. Install azaozz’s plugin. The TinyMCE 3.0 plugin will disable caching and compression when active.
2. edit tiny_mce_config.php, looking for
‘compress’ => true,
change to
‘compress’ => false,
3. Active and reactivate the plugins a few times, and clear your browser cache. Wait for awhile as it takes some time for the caches between you and your site to refresh.