i am just trying to keep the twentyeleven theme with some specific style changes, like font-family. i made the child theme and put everythin in the head of the style.css, as it is said in the codex.
i have no problem to change to this "new"theme, and it EVEN works as for the change on the font-family. BUT it looses the structure completely! (the menu don't display as a menu anymore, items come one above another, it has lost the size of continent,... WHY?