Index: wp-content/themes/twentytwelve/style.css
===================================================================
--- wp-content/themes/twentytwelve/style.css    (revision 22106)
+++ wp-content/themes/twentytwelve/style.css    (working copy)
@@ -1404,7 +1404,7 @@
        }
        .main-navigation li a,
        .main-navigation li {
-               display: inline-block;
+               display: inline;
                text-decoration: none;
        }
        .main-navigation li a {
@@ -1682,4 +1682,4 @@
 .ie img.header-image,
 .ie img.wp-post-image {
        width: auto; /* Prevent stretching of full-size and large-size images with height and width attributes in IE8 */
-}
\ No newline at end of file
+}