Flash has it's own version of cookies that not many people know about and are hard to delete. See http://www.wired.com/epicenter/2009/08/you-deleted-your-cookies-think-again/
If you want to delete them or stop them getting dropped on your computer you actually need to use a control panel on the Adobe site: http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_manager02.html#118539 -- Robert
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