CCleaner looked like a promising program from the start, but when I specifically indicated to it not to remove my cookies and hit the "Clean" command from the Recycle Bin, all my website passwords were immediately lost. What's going on here?
I don't use the Cookies to Keep feature personally, however you may want to tell CC what cookies to leave alone.
To find out how to keep cookies view section 'VII. Options' in the Beginner's Guide, or download the compiled version here for a local copy.