I am testing Atahualpa 3.5.3 with WordPress 3.1 release candidate 1 (released 25 Dec 2010).
This is a list of observations. I am not trying to solve them at this point, although some definitely need to be addressed.
1) Admin Mode Only: There is an admin bar across the top of the browser window and this causes relative elements to be displaced downwards while fixed elements and the background remain which is a mess. For example, it means the content of the logo area no longer fits and is clipped by the background of the page menu bar (I have categories menu off). While the menu labels themselves slip below the menu bar.
2) There is a number displayed in the top left corner of the content area on static pages just below the menu bar. The number is different on each page (perhaps it is page id?). For example at http://theWebalyst.com/home the number is "4", visible under "Home" in the menu.
Is anyone else playing with WordPress 3.1 RC1? If so, please post issues to this thread.
Mark