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It is doing this across all my sites that have skyscrapers, and it does it both the same in MSIE and Firefox.
Anyone else seeing this?
I've noticed over the past month that some 120x600, 160x600 links have changed colors.
Maybe Google is experimenting with something and temporarily changed the link color to the background color.
Sounds weird, I know.
This is costing me a ton of money i am sure and probably costing clients as a whole tens of thousands.
IMHO, I think this is the most important subject at this time and hope to get a response from a rep :)
I think it appears to come and go because only some of the ad servers are affected. If you see it yourself, report it to G!