Sometimes a bad cookie will stop a web site working properly, and maybe they get overwritten after a period of time. However I am loath to clear down cookies as a matter of course. Cookies are, I think, specific to a browser so that's why it works under one but not another.
I have an extension called EditThisCookie in Chrome, which appears an icon to the right of the address bar. You can click on it, look at what cookies the current page has open, and delete it if you want. It sometimes fixes a problem. There's probably other products that do the same thing.
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