In a local version of my website (olderwomensnetwork.org), I upgraded WP to 3.8 and then Atahualpa to 3.7.13. I resaved "style and edit Header" with Full Width Header option=No and "style and edit Footer." Now, one of my header components extends beyond the defined page (screen shot here): olderwomensnetwork.org/images13/OWNwithNo.png

I then switched the Full Width Header option to Yes, and it looks like this, with the page boundaries not observed in either the pattern top header or the picture strips: olderwomensnetwork.org/images13/OWNwithYes.png

How to get it back to the original (online version at olderwomensnetwork.org)? Or should I not upgrade just now?

Even on your 3.7.12 site the header image extends beyond the header if you resize the window. You may be able to hide the overflow with CSS or use a repeating pattern plus a title image for the header instead of a single image.

Thanks for this diagnosis. However, I was never bothered by the problem (overflow at reduced size) which apparently exists in 3.7.12 ! Suppose I just want to correct the overflow-at-full-size problem in 3.7.13 -- any ideas?

How wide is the largest you allow the page to be? ato->Style & configure LAYOUT->Layout MAX width?
how wide is your logo image?

When you set the new option 'Full Width Header' to 'yes', the header will fill the browser window. If your image is not wide enough, it will look truncated. make the image wider than the widest browser you can imagine .

My problem is not truncation but overflow -- the image is extending beyond the visual borders of the page. Layout max width = 1100 I would guess that the header(s) are the same, since when I expand the window size (in the online version), the extra space becomes margin and the visible page is the same width as the headers.