Some of my themes have the so called super user function. Basically what it does is it disables the theme options panel for all the users except for one which is the super user. This is useful for when you are customizing the theme for a client and you don’t want him to mess around the options page.
Anyway here is how to get your theme options back: Go to http://www.yoursite.com/wp-admin/options.php page and find the field “tn_super_user” and reset it’s value to be blank. Remember to hit save and you are all set.