Okay, will supply screen shots. I'm afraid your comment and link about the "Share This" plugin are a bit beyond my technical expertise. A friend of mine set this up for me and that's what he recommended. Is there another similar plugin you would recommend? It seems to work just fine, at least for Linkedin and Twitter -- it doesn't do so for FB. But I probably usually activate it from the post page, not the slider.
It's odd that you cannot recreate the problem. It shows up for me on both my laptop and my desktop, whether I'm logged in to WordPress or not. So I decided to see how it looks on my Droid and voila! no problem. Odd. I wonder if it has anything to do with my being logged into Chrome via my Google account and have (I think) chosen to have the two synced. Not sure why that would cause the problem, but whatever does maybe would show up on both the same way. I feel better knowing it's only me, but I'd still like to fix it so I can see how my blog looks to others!
Screen shots of:
1) my name peeking out from behind the post box
2) long post name hiding part of Share This
3) shorter post name not doing so
4) edit page for Header showing that text is there
an earlier one showing the page as it looked before I did the update
Thanks for your attention to this.