I just now uninstalled and reinstalled FF3 (it's a long story). I
left my profile there. Flash Player appears to be normal in youtube.

When I go to Yahoo.com on either FF3 or IE, the usual logo is not
there, and when I click on Mail, it says server not found. Some of
the usual small icons on not on the Yahoo main page. That would
suggest something is just wrong with Yahoo - but I see no postings on
it.

I also turned off/on the firewall on my AV and I doubt that could
affect it.