When I click on some (but not all) of the page links in the top menu bar, they show up as "Not Found." I've tried eliminating dashes in their titles and shortening them, but the same pages keep showing up as "Not Found." I have added all of the pages the same way so would appreciate help on solving this problem.
Here is a link to a page that demonstrates the problem:
A second, somewhat related problem re: the menu bar...Currently, I am using the Twenty Ten default theme and the page links in the menu bar show up in a large black box with a large amount of space between the four lines. Is there a relatively easy way of modifying the menu bar so that is much less intrusive and doesn't hurt the overall simplicity/aesthetics of the theme? I know that I can eliminate links but am looking for other options first (e.g., no black box and no extra space between the lines).