WordPress Visual Editor Not Showing Up In wordpress 2.8 and 2.9
if your Visual Editor Not working just do these simple steps.
In most of the cases all the tools in the HTML editor are working absolutely fine but visual editor is almost dead or it is first appearing as blank screen and then as copy of HTML editor.
There is no definite fix for this but here is the solution that has worked for most of the people.
Deactivate all installed plugins especially WP Super Cache plugin.
In your WordPress Admin Panel Go to Tools > Upgrade and click Re install Automatically.
after this clear you browser cache history and tem files.