Thank you for that input. I realized that that the picasaweb album might be the issue (I use the Embedded video with Link plugin for youtube videos) because of the ibed tags and I moved that post (along with the other two youtube posts, just in case) to draft, but it still did not resolve it.
Actually I see that on IE, a couple of posts with just text (and an image or two) are missing completely. And I have had that Picasaweb post for a week, but this issue did not seem to crop up till I upgraded.
But having said all that, I shall use that Viper Video Quick tags link and see if that makes a difference. I shall also go through those posts about the ibed tag much more carefully than I just did to see if I can get something out of it.
And here is the screenshot!
Someone see this happening?