theme options problem - theme options returns a blank page

hi, over the last few days i have been using the theme options with no problems at all then tonight when i tried to view them the apeared for a split second then dissapeared, see attachment

since having the problem i have reinstalled new wordpress installation and a fresh install of your theme.

thanks in advance, brian

sorry, please remove this post, i deleted my browser cache and the problem went away

thanks anyway