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I didn't click on the button to say what it was. It did happen on a bunch of other pages as well. Did not seem to be related to any embedded links (which the McAfee will do and pop up the warning--I never click on the McAfee option, so I never know what it is). I've only seen it last night on the desktop. Will check it out again tonight.
Well, I was happily reading through my usual suspects of threads with no warning. Then I went to post on this thread that I had no warnings, when lo-and-behold, the warning again!? And there are no embedded links here.