I wanted to move and update my site layout through the front-end toolbox today, and now my header and menus disappear every time I try to save them.
I have tried everything listed in the 'READ THIS Before You Post a Question' and I am still having the problem. The only header that will stay is the PressWork header, but once I save it too disappears.
I also had a slideshow on my site but it stopped working with the new WP update, but I think I saw that was already mentioned. (I just mentioning it in case it wasn't).
Likewise, whenever I hit "Add Widgetized Area" and update, both my primary nav menu and header dissapear entirely. If I add them back in with the front-end toolbar, they dissapear once I hit update (if the widgetized area was added again.)
The area does appear when I hit Add, but after I update, I am left with no header, no primary nav menu and no widgetized area. If I had other things added, I'm guessing they would have dissapeared too.
As a side note, it would be good to implement a 'centre-align widgetized area' feature.
I am having this same issue. But I think updating to WP3.3 is what triggered it. Not having the same issue on 3.2.1, even though I'm using PW 1.03 on both versions.