[SOLVED] Lost my whole header area in the course of a theme upgrade to 3.7.13?? Help!

I just updated today, first Wordpress itself (saw no problems immediately after that) and then Atahualpa - I *think* from 3.7.11 to 3.7.13 ...

For both updates, I used the "update" button rather than downloading and manually installing. In both cases it started OK and then seemed to 'hang' for ages and ages, so I closed the browser and then reopened. This worked fine for the WP update but ...

After the Atahualpa update suddenly my entire header area was gone - logo, blog title, header image, everything.

I tried switching to another theme and back again. Also tried deleting Atahualpa and then reinstalling it. No dice.

I have looked in options and I can't see any settings that seem off. BUT, it's been a while since I had my head under the hood here, so maybe my eyes aren't seeing something.

Any idea what went wrong? The site is http://GenuineEvaluation.com

Thanks