Visited links stopped changing color?

I have windows 7 and IE9 ... all of a sudden the links, to sites and pages I've visited have stopped turning purple, and remain blue. They used to change till a couple days ago. Might seem like no big deal, but it was pretty handy.

I've tried restarting. Any ideas?
Update: @ McMuffin ... That didn't work. Thanks though.
Update 2: OK ... I fixed it by deleting history web sites visited
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