The filters on the admin control panel don't seem to update when you delete the text in the filter using the web browsers built in "x" button inside the text box.
When looking at the phrases, if you type "create" it updates the list with all the phrases that match:
If you then delete the text "create" (by pressing the "x" inside the text box (a feature of <input type="search">):
It doesn't put all the phrases back (but it has cleared the text):
Browser is Chrome 9.0.597.67 on Mac OS X, same happens in Safari 5.0.3.