I upgraded to wp 3.1.2 and the css html inserts window dosen't expand to show

The "CSS Inserts" window only shows one line of text, I edit by selecting before the first letter and using page down to select all, copy, paste into an editor, edit, select all, copy, go back the css inserts window in the css/html inserts tab of the theme options, select all again, and use "ctl v" to replace all text.

Anyone else? any clues?

thanks in advance