In older versions of Acrobat Reader, using shift control F would open the search window. If you have already searched, then text would appear in the search window. If you want to search with a new keyword, just press shift control F again and the old text is highlighted so you can write over it. In version 8 and 9 you have to manually erase the text. It was much more efficient in the older version. Is there a preference that can be set. This is a big negative so I don't use the new versions. 99% of what I do is searching for text, so version 8 and 9 are not usable for me.