Searched items list not being cleared in IE or FF

Hi, using latest build of CC and have found that the browser cache of entered text (as entered for example into Google main text input box) is not being cleared in either Internet Explorer or Firefox. I have the options selected to do this but it isn't working. Everything else is OK.

CC version v1.19.105

WinXP

IE6

FF 1.0.3

Thanks for any help you may be able to give.