Visited links don't change color on Yahoo pages any more?

What did Yahoo do this time? A week ago I was looking at questions here on Y!A and everything was working just fine (relatively speaking). Yesterday I go back to it and suddenly everything is different. The page layout is changed, but that's insignificant. The links to questions I've already looked at won't change color any more. I've seen this on a couple other websites and it's annoying as hell. If I go into the browser options and set it to force the custom colors of the browser, the links change color appropriately. But set it back to display the pages as normal, and links on Yahoo pages don't change color. I can't keep the options set to display custom colors because it disables other parts of the page coding and the pages don't display correctly, but letting Yahoo pages display themselves as programmed prevent me from knowing which questions I've already looked at.

Why would anyone do something so stupid? It's domain-wide, not just on Y!A, and makes Yahoo pages even MORE user-unfriendly than they already were. Go back to the way the page coding used to be written, when it worked well, and stop messing with it!