Your Profile--> Visual Editor "Disable the visual editor when writing"
Checking the box for rich_editing on the user profile page changes it for the user meta. user_meta globals follow you from blog to blog and are loaded when you log in. Changing from blog to blog makes no difference as you'll be editing the same user profile each time anyway. If the value isn't being saved on your profile page, then there is something else wrong.
the $current_user global contains the rich_editing flag.
I agree with webmacster87, just toggle between the two while editing posts. If you can't toggle betwixt Visual/HTML then there is something else amiss.