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I always clear cookies, clean cache and clear the history. So this isn't the reason either. I even updated a couple and they are all on purple.
That doesn't always change it back. It just meant you have visited your hub from your account page by clicking on the title. Eugbug is right. And mine stay purple no matter if I clear history or not.
Just to state the obvious, when you clear your history, the check box for "history" needs to be checked. Also the page must be reloaded/refreshed to update everything and clear the purple color from visited links!